I present you NoStore!

This is a easy to use plugin which prevents the stuf you want from being dropped or stored into chests, trapped chests, furnaces, dispensers, brewing stands, enchantment tables, hoppers, droppers, anvils or enderchests. Here are a few uses:

Prohibit lava buckets as a fuel in furnaces.
Prevent griefing with dispensers (using water/lava buckets)
Prevent players from dropping specific items
Prevent players from enchanting certain tools.
Prohibit specific potions brewing.
Force players to keep certain items in hand...

It's pretty easy to config, here's the default config.yml, edit it according to your own needs :

chest_blacklist:
- 52
furnace_blacklist:
dispenser_blacklist:
- 326
- 327
brewingstand_blacklist:
enchantmenttable_blacklist:
hopper_blacklist:
dropper_blacklist:
anvil_blacklist:
enderchest_blacklist:
drop_blacklist:

(prevents spawners from being stored in chests and water/lava buckets in dispensers)

It supports permissions / OP :

nostore.allowchest.<id>
nostore.allowfurnace.<id>
nostore.allowdispenser.<id>
nostore.allowbrewingstand.<id>
nostore.allowenchantmenttable.<id>
nostore.allowhopper.<id>
nostore.allowdropper.<id>
nostore.allowanvil.<id>
nostore.allowenderchest.<id>
nostore.allowdrop.<id>

(Replace <id> with the item id, so it allows the player store the blacklisted item)

Command list:

/nostore

(Shows the version and author of the plugin.)

Note: This is my first plugin, I hope you find it useful :3 . Sorry for my English. Waiting for your reviews!