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[S.T.A.L.K.E.R]

Your Action point cost as if you were doing an unaimed shot. You are able to do aimed shot without any delay. However, your max hit chance is reduced by 35%. (Non fast shot = 60%, with fast shot = 55%)

Spoiler for Hiden:

[Myakot]

I like how it gives you an extreme advantage, with extreme drawbacks.
55% to hit is a tad-bit extreme tho.

[mAdman]

I endorse this idea +1

But unaimed cost for aimed shots might be too much, the idea of losing hit chance for the speed of an unaimed shot is probably enough.