Now if we had a wizard casting a haste type spell on him self and then trying to use a stunt, i dont think i would be ok with that. If i did i would say that there is a possablity of triping or something like that if they did no roll high enough..
I don't see why it wouldn't be okay. A maneuver is a maneuver, and can be tagged for +2, then invoked with FP as long as it lasts.
Of course, there's nothing saying you can't compel the aspect to make him trip.
If he doesn't like that he could of course use a skill-replacement type spell, throwing in six shifts of power to bump his Athletics up to Fantastic for a turn but that'd be a lot more expensive, as it should be, since there's no potential compel related downside.