diff --git a/ecs/ecs.can b/ecs/ecs.can
index b0c8648..afb531b 100644
--- a/ecs/ecs.can
+++ b/ecs/ecs.can
@@ -1,7 +1,7 @@
 --- ubiquitousse.ecs
 -- Optional dependency: ubiquitousse.scene, to allow quick creation of ECS-based scenes.
-local loaded, newScene = pcall(require, (...):match("^(.-)ecs").."scene")
-if not loaded then newScene = nil end
+local loaded, scene = pcall(require, (...):match("^(.-)ecs").."scene")
+if not loaded then scene = nil end
 
 --- Entity Component System library, inspired by the excellent tiny-ecs. Main differences include:
 -- * ability to nest systems;
@@ -268,70 +268,72 @@ let recCallOnAddToWorld = (world, systems)
 	end
 end
 
---- Create and returns a world system based on a list of systems.
--- The systems will be instancied for this world.
-let world = (...)
-	let world = setmetatable({
-		filter = (e) return true end,
-		s = {}
-	}, { __index = system_mt })
-	world.world = world
-	world.systems = recInstanciateSystems(world, {...})
-	recCallOnAddToWorld(world, world.systems)
-	return world
-end
-
---- Returns a filter that returns true if, for every argument, a field with the same name exists in the entity.
-let all = (...)
-	let l = {...}
-	return function(s, e)
-		for _, k in ipairs(l) do
-			if e[k] == nil then
-				return false
-			end
-		end
-		return true
-	end
-end
-
---- Returns a filter that returns true if one of the arguments if the name of a field in the entity.
-let any = (...)
-	let l = {...}
-	return function(s, e)
-		for _, k in ipairs(l) do
-			if e[k] ~= nil then
-				return true
-			end
-		end
-		return false
-	end
-end
-
-let scene = (name, systems={}, entities={})
-	let s = newScene(name)
-	let w
-
-	function s:enter()
-		w = world(unpack(systems))
-		w:add(unpack(entities))
-	end
-	function s:exit()
-		w:destroy()
-	end
-	function s:update(dt)
-		w:update(dt)
-	end
-	function s:draw()
-		w:draw()
-	end
-
-	return s
-end
-
 --- ECS module.
-return {
-	world = world,
-	all = all,
-	any = any,
-	scene = scene
+let ecs = {
+	--- Create and returns a world system based on a list of systems.
+	-- The systems will be instancied for this world.
+	-- @impl ubiquitousse
+	world = (...)
+		let world = setmetatable({
+			filter = (e) return true end,
+			s = {}
+		}, { __index = system_mt })
+		world.world = world
+		world.systems = recInstanciateSystems(world, {...})
+		recCallOnAddToWorld(world, world.systems)
+		return world
+	end,
+
+	--- Returns a filter that returns true if, for every argument, a field with the same name exists in the entity.
+	-- @impl ubiquitousse
+	all = (...)
+		let l = {...}
+		return function(s, e)
+			for _, k in ipairs(l) do
+				if e[k] == nil then
+					return false
+				end
+			end
+			return true
+		end
+	end,
+
+	--- Returns a filter that returns true if one of the arguments if the name of a field in the entity.
+	-- @impl ubiquitousse
+	any = (...)
+		let l = {...}
+		return function(s, e)
+			for _, k in ipairs(l) do
+				if e[k] ~= nil then
+					return true
+				end
+			end
+			return false
+		end
+	end,
+
+	--- If uqt.scene is available, returns a new scene that will consist of a ECS world with the specified systems and entities.
+	-- @impl ubiquitousse
+	scene = (name, systems={}, entities={})
+		let s = scene.new(name)
+		let w
+
+		function s:enter()
+			w = ecs.world(unpack(systems))
+			w:add(unpack(entities))
+		end
+		function s:exit()
+			w:destroy()
+		end
+		function s:update(dt)
+			w:update(dt)
+		end
+		function s:draw()
+			w:draw()
+		end
+
+		return s
+	end
 }
+
+return ecs
diff --git a/input/input.lua b/input/input.lua
index 403cc19..472de08 100644
--- a/input/input.lua
+++ b/input/input.lua
@@ -501,6 +501,7 @@ input = {
 	-- identifier, preceded by a % : for example "gamepad.axis.1.leftx%-0.5" should return true when the left-stick of the first gamepad is moved to the right
 	-- by more of 50%. The negative threshold value means that the button will be pressed only when the axis has a negative value (in the example, it won't be
 	-- pressed when the axis is moved to the right).
+	-- Buttons can also be defined by a list of buttons (string or functions), in which case the button will be considered down if all the buttons are down.
 
 	--- Makes a new button detector from a identifier string.
 	-- The function may error if the identifier is incorrect.
@@ -509,7 +510,7 @@ input = {
 	-- @impl backend
 	basicButtonDetector = function(str) end,
 
-	--- Make a new button detector from a detector function of string.
+	--- Make a new button detector from a detector function, string, or list of buttons.
 	-- @tparam string, function button identifier
 	-- @impl ubiquitousse
 	buttonDetector = function(obj)
@@ -517,6 +518,19 @@ input = {
 			return obj
 		elseif type(obj) == "string" then
 			return input.basicButtonDetector(obj)
+		elseif type(obj) == "table" then
+			local l = {}
+			for _, b in ipairs(obj) do
+				table.insert(l, input.buttonDetector(b))
+			end
+			return function()
+				for _, b in ipairs(l) do
+					if not b() then
+						return false
+					end
+				end
+				return true
+			end
 		end
 		error(("Not a valid button detector: %s"):format(obj))
 	end,
diff --git a/scene/scene.lua b/scene/scene.lua
index de6525e..48d6c62 100644
--- a/scene/scene.lua
+++ b/scene/scene.lua
@@ -26,7 +26,7 @@ if not loaded then timer = nil end
 -- * all scene change callbacks are called after setting scene.current to the new scene but before changing scene.stack
 -- * all scene exit/suspend callbacks are called before scene enter/resume callbacks
 local scene
-scene = setmetatable({
+scene = {
 	--- The current scene table.
 	-- @impl ubiquitousse
 	current = nil,
@@ -34,6 +34,9 @@ scene = setmetatable({
 	--- Shortcut for scene.current.timer.
 	-- @impl ubiquitousse
 	timer = nil,
+	--- Shortcut for scene.current.signal.
+	-- @impl ubiquitousse
+	signal = nil,
 
 	--- The scene stack: list of scene, from the farest one to the nearest.
 	-- @impl ubiquitousse
@@ -77,6 +80,7 @@ scene = setmetatable({
 			name = name or "unamed", -- The scene name.
 
 			timer = timer and timer.new(), -- Scene-specific TimerRegistry, if uqt.time is available.
+			signal = signal and signal.new(), -- Scene-specific SignalRegistry, if uqt.signal is available.
 
 			enter = function(self, ...) end, -- Called when entering a scene.
 			exit = function(self) end, -- Called when exiting a scene, and not expecting to come back (scene may be unloaded).
@@ -101,8 +105,12 @@ scene = setmetatable({
 		local previous = scene.current
 		scene.current = type(scenePath) == "string" and scene.load(scene.prefix..scenePath) or scenePath
 		scene.timer = scene.current.timer
+		scene.signal = scene.current.signal
 		scene.current.name = scene.current.name or tostring(scenePath)
-		if previous then previous:exit() end
+		if previous then
+			previous:exit()
+			if timer then previous.timer:clear() end
+		end
 		scene.current:enter(...)
 		scene.stack[math.max(#scene.stack, 1)] = scene.current
 	end,
@@ -118,6 +126,7 @@ scene = setmetatable({
 		local previous = scene.current
 		scene.current = type(scenePath) == "string" and scene.load(scene.prefix..scenePath) or scenePath
 		scene.timer = scene.current.timer
+		scene.signal = scene.current.signal
 		scene.current.name = scene.current.name or tostring(scenePath)
 		if previous then previous:suspend() end
 		scene.current:enter(...)
@@ -131,8 +140,12 @@ scene = setmetatable({
 	pop = function()
 		local previous = scene.current
 		scene.current = scene.stack[#scene.stack-1]
-		scene.timer = scene.current.timer
-		if previous then previous:exit() end
+		scene.timer = scene.current and scene.current.timer or nil
+		scene.signal = scene.current and scene.current.signal or nil
+		if previous then
+			previous:exit()
+			if timer then previous.timer:clear() end
+		end
 		if scene.current then scene.current:resume() end
 		table.remove(scene.stack)
 	end,
@@ -164,12 +177,7 @@ scene = setmetatable({
 	draw = function(...)
 		if scene.current then scene.current:draw(...) end
 	end
-}, {
-	--- scene(...) is a shortcut for scene.new(...)
-	__call = function(self, ...)
-		return scene.new(...)
-	end
-})
+}
 
 -- Bind signals
 if signal then