I haven't tested this yet, but it should work.
At the beginning of every gaming session, each character begins with 3 "chips" (and I would use poker chips or such) which they can spend during play. When they do heroic or cool stuff, they get another chip.
When a character spends a chip, he get's a free 15 real points to spend during his action this phase. And he can spend it on almost anything he can wrap his brain around. As an example, if he needed to roll better, he can spend the 15pts on skill levels on his OCV or DCV, which, if they cost 5pts, he would get a +3 bonus. No rerolls necessary (you don't want that much rerolling anyway, some things just can't be done). And they can spend as many hero chips as they want.
The player can choose to spend the points on more than just levels... +3d6 Energy Blasts, +PD/+ED Force Field, +5" Superleap (0END), etc... the GM has final call on what can't be done...
This little mechanic allows normal heroes to barely escape disaster, leap that gorge, and shoot just good enough to drop that wild Rhino...
Hope this helps some,
Jak