that wasn't really a transformation but more of a.. first aid? not first aid.. more of a repairing of his damaged self... instead of that i say go for frieza 100% being super beefy >_< but i think he has enough transformations as it is
For this game, I think he's going to be balanced enough. But if you're liking BTL, then 100% and perhaps Mecha will be there as seperate forms.
Either way, since frieza has many transformations, he'll be one of the stronger characters in the game already due to power multipliers (unless they were greatly reduced). Frieza's not gonna be gimp or anything.
Besides, you can always use an unofficial 100% model someone's gonna make probably.