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Pretty much every rwd car sold in America understeers significantly. This is because the auto makers see this as a safety feature. The 135i's out-of-the-box understeer has been discussed on this board a good bit already.
My concern about rotating tires is that you can get a lot more from track tires if you can swap them front to back, and some r-comps are bi-directional in dry conditions (toto ra-1, for example). The excellent falken rt615 is bidirectional too.
I just don't see that a staggered setup for a weight balanced car makes sense, except that it looks cool. Sure, there are ways to dial out the understeer without changing the wheels (more camber in front, mostly), but then you make even more of an issue of tire wear.
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