Overkill is my middle name. I think I could probably stand on it...and if the stud were crooked I'd shoot a screw and straighten it out rather than add a shim.

Really, usually I just go to the next stud if it's really twisted. I space outlets closer than 12', so I have options for studs to use. I much prefer steel studs for the same reason I prefer conduit...it's always straight unless the fork truck hits it.

Dave