I have been looking around a lot and I can't seem to find anything about it. I am just wondering if there is a mcmmo mod for single player. Where you have the stats and you can use the abilities once they get higher.
Mcmmo is a bukkit plugin that is only avaliable on servers. If you want to have this on a single player world you could simply make a bukkit server and not port forward it. This isn't technically single player but it's as close as your gonna get