In Freetrack the "center" button do that and should do the same in FaceTrack, cause it's supposed to center all axis including Z. You can use the mouselook or camera buttons only with the external view, it creates a sort of conflict with the headtracking with internal views.
About the crashes at exit, it happens for some, doesn't for some other, I'm not aware of a solution about those crash, it's a compatibility problem.