First you have to look what MCMMO does. MCMMO modifys the XP gain, not for enchanting, but for leveling up your player in certain skills. Now how would this effect us on MeepCraft? MCMMO would give the players which do certain skills to be more OP over noobs. So lets say Mockingbird123 PvPs all the time, he gets the max level sword xp possible. Now Katniss33 joins Meepcraft, gets prot 4 god armor, god sword, and gapples. Goes into PvP. Now Mockingbird would have the advantage over Katniss because of his/her sword xp.
Now we know Mockingbird worked for his/her sword xp. But yet Katniss loses to Mockingbird, rages and quits MeepCraft never to join again, just because Mockingbird and Katniss has the same everything but sword xp. Which makes Katniss thinks Meepcraft is unfair and corrupted. So in my opinion to order to keep adding to our player base and have a good word to Meepcraft, MCMMO would be a bad idea. -1