Bukkit

I think you should add some administrative potions.

Wolfcure - 3 bedrock 1 wolfsbane potion. Permanently cures wolfsbane. Reason: It's annoying how you become a werewolf and you want to change back into a human because you lag (happens to me sometimes) and then administrators say: I can't fix it there's no permanent cure.

Memory clearing potion - 3 bedrock 1 memory potion. Will clear all spell exp and change destined wand type, also clears all paired wands. Reason: People who have tons of stolen wands, could add a new administrative spell to OPs only.
Administrative potion force-drink spell - Incantation - Potius - Will cause potion closest to wand to be administered.

Wand-blocking potion - 4 bedrock 1 memory potion 1 wolfsbane potion - Will disable someone's magic for a certain amount of time depending on how strong the XP of the spell is used to make this.
Wand-blocking potion making spell - Incantation: Potantius Blockius *only usable by OPs* If spell is mastered and used to remove someone's magic will permanently remove it. Curable by next potion

Wand-Flowing potion - 3 bedrock 1 Wand-blocking potion - When drunken will cure the effects of the wand-blocking potion.