Going to echo what Yellena said. Even if you had a Two Minute timer between uses, several classes would be helped, or almost not changed at all, by allowing some sort of timer between innate ability uses.
These in particular:
Shadow-dancer, Assassin, Blackguard, and Harper Scout.
Classes that there are really no reason to invest heavily in. Just go 5 in SD for HiPS; assassin is inferior to rogue; blackguard is another that is only invested 3-5 in, and all it's abilities are weak; lastly Harper, just all around isn't good.
Monk is great already, and Pale-Master can get ridiculous in its own regard. Ain't nothin' needed on those two.
Honestly, this kind of change seems a lot like Barbarian. Instead of /per-day uses, their rage was given a timer.
Innate Abilities
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