Bukkit

Add a cooldown to certain projectiles/wands so that they cannot be spammed.

The new scoreboard system (version 1.4) will effectively have cooldown, because the mana is regenerated. I suggest you try it once it's out and see if it works for you.

@eyalzh: Go

That's different. A cooldown will not allow you to spam any spell, be it cheap or expensive, while lack of mana would only prohibit spamming expensive spells. Unless I misunderstood something, of course.