Since you refuse to rotate your tires I would suggest that you stay off the hammer. Even wear across both rear tires indicates that your alignment is correct. If the alignment was off you would have an unusual wear pattern, e.g. less tread on the inside tread than outside. You just burnt the rubber off. Even with traction control the rear tires will still "scrub" on the road surface under hard accleration causing shortened tread life. That's why people who do a lot of in city driving tend to wear the outside edges of thier front tires more.
FWIW I cross rotate every other service. Never had a problem.
