If you don't mind a little cheat, then you can do this:
While ingame goto Character - Statistics - Export Character
Then save and quit the game.
Then go into the M&B:W Characters folder, located in "My Documents" if you can't find it, simply search for the name of your character.
Then load up the notepad/wordpad/whatever file, and change the stats, then save.
Then load that character up, go to Character - Statistics - Import Character
Tadar!
Complete with the warband battlesizer located at:
http://forums.taleworlds.com/index.php?topic=103106
You can have alot of fun.