Assuming you wanted more lethality (in the form of one-hit kills), wouldn't it be fairly easy to say that "excess" successes convert directly to wounds? This allows a similar effect to Ulric's Fury, assuming there is at least one expertise die in the pool.
Similarly, you could allow the max fortune points to be "burned" for use like a fate point, if you wanted that effect in the game.
Of course, for all I know, both rules already exist... I haven't had a chance to read the official rules, yet.