I tried the same thing back in the early '80s. I think I read about in a magazine, but I'm not sure.I can alter die rolls or handwave certain results, but every time I do, I have to give the players resources that they can use to change die rolls.
That can make for a very nice balance, and some sort of flexible resource seems par for the course in superhero games. Maybe one reason is that in the comicbooks the heroes are very reactive, routinely letting the villains (or the GM, in a game) take the initiative.