@Blk4ce:
That's a specific limitation on sorcerers. You're a sorcerer if you got that template. If you don't have that template, then you don't have the limitation that goes with it. That doesn't mean you specifically need to be a wizard to take several refinements.
Examples from the books:
1) Russel Carson, YS p 388. Neither a sorcerer nor a wizard and he has 3 refinements.
2) Kravos' Ghost, OW p 63. Sorcerer ghost, 6 refinements.
3) Tessa, OW p 166. Denarian with only Evocation, 6 refinements.
4) Rosanna, OW p 222. Denarian with only Evocation, 3 refinements. Though she should have had Hellfire, too.
@Locnil:
Sorry, doesn't work like that. The type of the attack is always based on the flavor, not the mechanics. A spirit blast is magical force and won't affect a magic-immune demon. A magically thrown boulder is physical force and will. A sword is physical force and won't affect a physically-immune demon. A blessed sword is holy and will.
Harry Dresden has exploited this in fights in half a dozen books to hurt magically-immune foes, break circles and so on and so forth. He'd be dead a half-dozen times over if it couldn't be done.