Heya. I am a GM thinking about setting up a campaign and I have some fun ideas for mechanics. This is one of them
Aspects always give a +1 to relevant rolls. But you can only choose one of the 'areas' Aspects like to hang out in. One character, one scene, one scenario and one opposition Aspect at most. You can not spend FATE points to push up the bonus to a +2, instead you can spend them to grab more than one Aspect per 'area'. One per FATE point spent.
Stunts also only grant +1, to ground them a bit, but can alternatively give 2 shifts of success. So you actively have to choose between accuracy or "damage". Free invokes also only enable you to choose that Aspect in addition to another on