I am pondering the value of assigning particular affinities or flavors to Fate point rewards. This would generally require the GM to have a variety of tokens to hand out, of course.
For example: a player earns a Fate point for self-compelling an Aspect that would infuriate him (let's say, having to let a criminal go on a technicality), and instead of getting a white poker chip, the GM provides an "anger-flavored" red poker chip. Later, that player gets into a conflict - perhaps even with the criminal from the earlier self-compel - and spends a Fate point to get a bonus to a roll that is in line with venting that anger/fury/etc.: could the system stand allowing that player a +3 for using an anger-flavored Fate point for an anger-flavored action? Would you propose a lesser benefit of some sort: possibly an automatic success one one or more of the dice used in the roll?
I would not propose making the flavored Fate point less useful for actions that are opposed to the flavor - just a benefit for redirecting that energy back out into the universe - a sort of Fate point Aikido.