Sure it can...

So you take a cossie, crap grip and it understeers, fit somert that makes it grip's more and it corrects this, even if you have not touched the front end which as i understand it, if the front doesn't grip it understeers.

I know for a fact in my own car when i ran slicks on the back and not on the front, the understeer was terrible......swapped wheels and oversteer was terrible.

Regardless of what the beem does to wheels, in theory, if you increase cornering grip at the back, you create understeer / reduce oversteer to the front