For humans there should be some sort of power up like full potential unlocked in budokai 3 that krillin and gohan get. It would make humans and saiyans more equal in terms of power, since saiyans have super saiyan and can just destroy humans
there will be a powerup type for humans too.
consider it that it is a fan mod and not an official game.
i may add my own ideas and imaginations of power upping if i want XD
and i want to keep balance too.