diff --git a/README.md b/README.md
index 5771250..7136f76 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ By [PilzAdam](https://github.com/PilzAdam),
 [texmex](https://github.com/tacotexmex/), [hybriddog](https://github.com/hybriddog/).
 
 ## Description
-This mod adds Minecraft like drop/pick up of items to Minetest.
+A highly configurable mod providing item magnet and in-world node drops
 
 ## Licensing
 LGPLv2.1/CC BY-SA 3.0. Particle code from WCILA mod by Aurailus, originally licensed MIT.
@@ -31,6 +31,8 @@ developed by [PilzAdam](https://github.com/PilzAdam/item_drop).
     items between these radii are flying to the player for
     `item_drop.magnet_time` seconds, after this time, they're picked or stop
     flying.
+  * Enable manual item pickups by mouse only if `item_drop.mouse_pickup` is
+    `true` (true by default)
 * Plays a sound when the items are picked up with the gain level set to
   `item_drop.pickup_sound_gain` (default 0.2)
 * Requires a key to be pressed in order to pick items if
diff --git a/init.lua b/init.lua
index 2f3318f..2e3f9eb 100644
--- a/init.lua
+++ b/init.lua
@@ -1,5 +1,27 @@
 local load_time_start = minetest.get_us_time()
-pickup_radius = tonumber(minetest.settings:get("item_pickup_radius"))
+
+-- Functions which can be overridden by mods
+item_drop = {
+	-- This function is executed before picking up an item or making it fly to
+	-- the player. If it does not return true, the item is ignored.
+	-- It is also executed before collecting the item after it flew to
+	-- the player and did not reach him/her for magnet_time seconds.
+	can_pickup = function(entity, player)
+		if entity.item_drop_picked then
+			-- Ignore items where picking has already failed
+			return false
+		end
+		return true
+	end,
+
+	-- before_collect and after_collect are executed before and after an item
+	-- is collected by a player
+	before_collect = function(entity, pos, player)
+	end,
+	after_collect = function(entity, pos, player)
+		entity.item_drop_picked = true
+	end,
+}
 
 if minetest.settings:get_bool("item_drop.enable_item_pickup") ~= false and
 minetest.settings:get_bool("enable_item_pickup") ~= false then
@@ -9,7 +31,8 @@ minetest.settings:get_bool("enable_item_pickup") ~= false then
 	local pickup_particle =
 		minetest.settings:get_bool("item_drop.pickup_particle") ~= false
 	local pickup_radius = tonumber(
-		minetest.settings:get("item_drop.pickup_radius")) or 0.75
+		minetest.settings:get("item_drop.pickup_radius")) or
+		tonumber(minetest.settings:get("item_pickup_radius")) or 0.75
 	local magnet_radius = tonumber(
 		minetest.settings:get("item_drop.magnet_radius")) or -1
 	local magnet_time = tonumber(
@@ -30,6 +53,11 @@ minetest.settings:get_bool("enable_item_pickup") ~= false then
 			pickup_age = math.min(pickup_age, 0)
 		end
 	end
+	local mouse_pickup = minetest.settings:get_bool(
+		"item_drop.mouse_pickup") ~= false
+	if not mouse_pickup then
+		minetest.registered_entities["__builtin:item"].pointable = false
+	end
 
 	local magnet_mode = magnet_radius > pickup_radius
 	local zero_velocity_mode = pickup_age == -1
@@ -53,6 +81,7 @@ minetest.settings:get_bool("enable_item_pickup") ~= false then
 
 	-- adds the item to the inventory and removes the object
 	local function collect_item(ent, pos, player)
+		item_drop.before_collect(ent, pos, player)
 		minetest.sound_play("item_drop_pickup", {
 			pos = pos,
 			gain = pickup_gain,
@@ -94,6 +123,7 @@ minetest.settings:get_bool("enable_item_pickup") ~= false then
 			end
 		end
 		ent:on_punch(player)
+		item_drop.after_collect(ent, pos, player)
 	end
 
 	-- opt_get_ent gets the object's luaentity if it can be collected
@@ -139,7 +169,8 @@ minetest.settings:get_bool("enable_item_pickup") ~= false then
 			end
 			local item = ItemStack(ent.itemstring)
 			if inv
-			and inv:room_for_item("main", item) then
+			and inv:room_for_item("main", item)
+			and can_pickup(ent, player) then
 				collect_item(ent, object:get_pos(), player)
 			else
 				-- the acceleration will be reset by the object's on_step
@@ -224,7 +255,8 @@ minetest.settings:get_bool("enable_item_pickup") ~= false then
 		for i = 1,#objectlist do
 			local object = objectlist[i]
 			local ent = opt_get_ent(object)
-			if ent then
+			if ent
+			and item_drop.can_pickup(ent, player) then
 				if not inv then
 					inv = player:get_inventory()
 					if not inv then
@@ -242,10 +274,13 @@ minetest.settings:get_bool("enable_item_pickup") ~= false then
 						flying_item = vector.distance(pos, pos2) > pickup_radius
 					end
 					if not flying_item then
-						-- collect one item at a time to avoid the loud pop
+						-- The item is near enough to pick it
 						collect_item(ent, pos, player)
+						-- Collect one item at a time to avoid the loud pop
 						return true
 					end
+					-- The item is not too far a way but near enough to be
+					-- magnetised, make it fly to the player
 					local vel = vector.multiply(vector.subtract(pos, pos2), 3)
 					vel.y = vel.y + 0.6
 					object:set_velocity(vel)
@@ -294,8 +329,9 @@ and not minetest.settings:get_bool("creative_mode") then
 				name = item:get_name()
 			end
 
-			if name == "" then
-				-- Sometimes nothing should be dropped
+			-- Sometimes nothing should be dropped
+			if name == ""
+			or not minetest.registered_nodes[name] then
 				count = 0
 			end
 
diff --git a/screenshot.png b/screenshot.png
new file mode 100644
index 0000000..1313e40
Binary files /dev/null and b/screenshot.png differ
diff --git a/settingtypes.txt b/settingtypes.txt
index 0bf3684..4896788 100644
--- a/settingtypes.txt
+++ b/settingtypes.txt
@@ -33,3 +33,6 @@ item_drop.magnet_time (Magnet time) float 5.0
 
 #Time delay in seconds after autopicking an item if it's dropped by a player
 item_drop.pickup_age (Pickup age) float 0.5
+
+#Enable manual item pickups by mouse
+item_drop.mouse_pickup (Mouse pickup) bool true