Absolutely squat with a heel. Weightlifters are not the only guys using elevated heels to squat...every succesful IPF/USAPL lifter that I can think of used some heel elevation in their squat shoes.
I'm not even convinced that it shifts the emphasis away from your 'posterior chain,' and onto your quads, which is more a function of, as you mentioned, sitting back and using your hips rather than heel elevation.
However, I would counsel you against using a plate or heel block rather than a shoe with an elevated heel. For some reason, a heel lift without graduation seems to cause knee problems, whereas a shoe with a lifted heel (where the incline from front to back is graduated,) does not cause any knee issues.
So ignore the morons who've bought into the "everybody should squat in Chuck Taylors" bullshit and get yourself a nice pair of adistars or the like.