I have some thoughts on how magic will be handled/structured, along with circumstances (will require a fairly robust weather cost, lezbehonest).
But I also need time to flesh it out.
@Zz - I entirely intend to make it a sort of comfort level. As I stand now, Staff-run stuff won't veer there. PRPs can, but if it fits into <X categories, including those mentions>, players must basically sign off on something saying they're OK with it.
That way it's fully opt-in for things that go there as it were, but there'll still be plenty that doesn't.