add all the gamemodes (especially /gamemode 0)
add /enchant (let us have infinite values or atleast up to 10)
:D
Its so hard to punch all those grass/stone blocks when you could easily mine it away with a eff 10 tool in gamemode 0
Of course when worldedit comes this wont be needed but it could be used as a test pvp arena.
and /fly when in gamemode 0