Trab said it best with the two most important things about squating.
1) whatever the foot spacing, the flat footed squat will bring the glutes into play (actually the quads, hams and glutes act as a unit when doing most leg exercises..can not have one without the other). If you do want to squat, and reap the benefits, than place the heels on a 2X4, 45lb plate(s), etc to direct more action on the quads/tear drop effect and away from the butt. Keep the upper body somewhat straight throughout. Can do this with BB Hacks also.
2) that the squat is one of the superior compound exercises to indeed crank up the BMR to place it in a muscle building state as well as a fat burning zone. Anyone stuck at a point of very slow or no gains might try a short program based around the squat. If a training blast is needed, than try 20 rep breathing squats (or a form of) for max gaining results, with pure muscle mass as the bottom line. Can also apply this method to the DL, SLDL, clean& press/jerk, power cleans, etc. Can do all the leg presses, machines, etc but never approach the effect of heavy, higher rep squating results. And in a much shorter period of time.
If you pre-deposed for a large butt (or hips), you probably have one even before taking up lifting. All the worse if your overweight. For the most part the glutes, for most people, will not dominate over the legs when both are highly developed. Squating can be a major part of anyones full leg program without taking the butt to a too higher level. Women should not be afraid to put in some training time with squats. It can be a great exercise for them, when done right.
Might try one legged exercise also for a balance leg/ham/glute development in both legs.. The step-up or lunges for example. Good Luck.
