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In addition to the effect on dynamic tracking (toe) the change in offset will mean the track is altered. A narrower track (more negative offset) means the roll centre will be higher and the jacking (lifting) component of the cornering force higher (= bad).
The effects may not be the same front and rear. That will alter the weight transfer distribution, which is the basis of tuning handling on a 4-wheel vehicle. At best, the result will be unpredictable.
The change in offset will alter the loads on the wheel bearings.
Even small changes (like < 1/2") in wheel offset can lead to things like wheel shimmy (feels like out of balance wheels).
Using spacers to get back to the standard wheel offset solves some (most) of the problems but loads the wheel differently to its design load.
I really don't like altering wheel offsets from the factory specification. Surely there's an alternative.
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