Re: Maple neck Strat with a warp!
That is a twist. Necks can be perfectly playable with twists IME. It isn't really that uncommon of a thing. If it does hinder a decent setup of the guitar, it can be worked around. If it really is a permanent twist, the frets can be leveled to counteract it, but only if they have enough meat on them. If not, a refret with taller frets is probably in order...or a re-radius of the neck.
When you get into that kind of work on a bolt-on neck, though, it would have to be sentimental or historically important to you in order to warrant the cost over a simple replacement neck. In Leo Fender's brain, fret replacement, or repair of a twisted neck would be silly when you could simply take it down to your nearest Fender dealer and have a new neck retrofitted for a reasonable price. That's why you will sometimes see antique '50's Fenders with '60's necks on them. Fender doesn't do that any more, but they do license outside companies to make replacement parts. Examples are Warmoth, Musikraft, B. Hefner, etc.