Interesting question. First answer that pops into my mind is "don't use anim curves", ie. build your animation behavior in a separate fsm, having the wait duration between state updates controlled by a (possibly global) variable.
Thinking about it further though, these anim curves should definitely get a "multiplier" public variable to affect their speed. I haven't checked the code but it doesn't seem like anything tough to implement, and yet it'd be extremely useful to customize gameplay and animated feedback. Maybe make it a feature request?