@Problematic And it is, indeed, one of the coolest parts of the game. (Though I'd have to ask, is there any part that is actually cooler than the others when the whole thing is Superb ?)
@PearsonArtPhoto Figure it out with your players. I can't tell for Accelerated (not too fresh in my memory) but Core has excellent World creation mechanics based on basically just asking everyone what they want.
Mathematically, there has to be a way to end up with GURPS... "On a scale of 1 to 5, with 1 being 'Uncle!' and 5 being 'Bring the embers!' how masochistic do you think you are ?"