I think that this is always a good add to the game it gives the players something huge to aspire towards you know? the bijuu's are of course Shukaku and Kyuubi and i think they should multiply your stats by a set amount.. same thing for cursed seal but that should be a little less potent unless your in Cursed seal 2.. then i think you should be on par with the Bijuu's.. thats just my two sense... anyway peace!
I like the idea, but if you put Curse Seal in the game, then every clan will need a transformation. I like the diea, don't get me wrong, but it is kinda of complicated. This isn't DBZ where we can go ssj Curse Seal, lol.