DROPBLOCKER
DropBlocker is a very simple plugin which will allow you to stop players from dropping items (Both by pressing Q or when they die)
You simply add or remove an item from the block list with commands or edit it manually in the config.
COMMANDS
/db add [item id] [all/world] , to stop players from being able to drop the item specified in all worlds or the world specified.
/db del [item id] [all/world] , to allow players to drop the item specified in all worlds or the world specified..
PERMISSIONS
db.override : Will override any blocked its so the player will still be able to drop them.
db.admin : will allow you to use the commands.