Another big question re: Centaurs and Charging Lances is:
If the centaur wants Spirited Charge, how many feats will it cost him? (i.e. can a centaur 'ignore' one or both of the pre-reqs, which obviously were not written with a centaur in mind)
It's safe to say, it's House Rules territory, so it would make sense to just make up a different chain of feats for a centaur to get Spirited Charge.