Bukkit

0.7.1: fixed bug with Durability not working for snowgrenades. (Thunder)
0.7.2: added config node:
CustomgrenadeEffectArea: 7
How big (in Blocks) the area, in which players are getting the Effect, is.
0.7.5:

• added config node:
  SneakingOnly: true
  If true, you'll only be able to throw grenades, while sneaking.
  
• Fixed Bug in CustomGrenade Area
• Code cleanup

• You need to give the permissions. (isnt really an caveat, is it?)
• May not work with other Plugins, which let you throw Snowballs, Eggs, your Custom Grenades or Slimeballs with Left Click.