I'm not recommending MoG over Cults by posting this, since everyone and their dog knows I think very highly of Voriof's work, but your post kinda confused me, Elgrin.
elgrin said:
On the other hand, with the Rulebook and Magic, creating or transforming another ethos to RQ rules would generally be within the scope of most competent GM's.
Everything in
Magic is Gloranthan-specific. It's a book about the God Learners, the Dragonspeakers, and HeroQuesting, after all. Using the stuff in it for generic RQ or to help shape other game worlds is probably the last thing I ever thought I'd hear anyone recommend it for.
Apart from the intensely Gloranthan-specific Draconic Mysticism and HeroQuesting, the only other magic rules like Sorcery and Divine Magic are core rules found in the Companion.