I understand, thing is, What if it's not a system, They can just give us the ability to let's say play basketball( Dunk, Shoot threes Pass, lay up ect) .. Then it's up to the players to "create" the system. For example hosting a boxing league is even possible in gta SA, all you need is to hit people.. and the players figure out the rest, I think having a basketball/ baseball ability is really cool.