Staggered wheels (width) and Handling

This is and observance from me that I ask everyone to think about it before responding. (FYI, I wrote this for the Scionlife forum. But I would like to hear more opinions.)

The reason I am posting here is because I have a friend with a WRX that is running Hotchkis Sways. On the lowest setting he now gets oversteer instead of understeer. So wouldn't combining sway bars that induce oversteer with staggered wheels be better? Another thing, hox would wider rears make understeer worse on a car with understeer already? The front wheels begin sliding at the same speed no matter how big the rear wheels become (relative to the turn). I mean, of course you want the front wheels as wide as possible, but rears have more room, typically, for wider wheels. I know some professional AWD cars run larger front wheels for stability, but maybe that is way into the extreme for handling that rquires a LOT of fabrication?

My view: I have read quite a bit about people who get Hotchkis or Progress (maybe even TRD) sways and the understeer becomes oversteer. This is where staggered wheels should be awesome. It is obvious that with more tire in the rear of the car, the harder it would be to slide them and thus, useful! This means that the wider the rear wheels, the faster you can go in a turn before you get oversteer. Maybe it is not even 5 mph faster, but like an S-pipe or CAI, every little bit helps.

This leads me into the next argument that the tC does not have enough power. Aside from the obvious of getting a turbo kit to up the power, there is the fact that in a road course, and even an AutoX, the car is already rolling and does not need to overcome as much of the weight as when the car is at a dead stop. Add to the fact that you can corner faster so you do not have to slow down and accelerate as much in these turns.

Now, this comes from my observations and logic. With that, comes my question. Does having the rear wheels further from the body mess with the turning geometry and hurt handling? I do not know much about suspension geometry but, like the springs argument, its seems like there could be a benefit to go so far and at a certain point the handling reaches maximum effectiveness before deteriorating. Maybe being wider than 2" in the rear (combined) there is a positive or no effect on handling or maybe my car will flip and burst into flame, the radio cover shoots off into my arm and the clutch pedal shoots back then forward throwing my knee into my face.

Common sense is that there are many manufacturers that use staggered wheels (specifically for sports cars). I mean, check out the Z06 Corvette: 18" x 9.5" front and 19" x 12.0" rear ! Let us not forget that the C6 did very well on the road course for Top Gear.