Warhammer and WH40K RPGs II: Burning Witches, Heretics, and Fate

[Squark]

Just to get the obligatory rules out of the way:
No Female Space Marines, and No Squats.

While I'm not opposed to such things a rule, have they been a problem in the past? If not, I don't see a reason to pre-emptively ban them. If there was and there'd been a collective agreement I'm not aware of, though, I'll add it to the OP, of course.