Okay, how about this... If I need a few mm extra for the small cog to clear the dropout, would it be preferable to 1) add a couple washers to both sides of the axle, force the dropouts apart a bit and leave the wheel dish the way it is, or 2) move spacers from NDS to DS, keep OLD the same and redish the wheel? Does it matter much one way or the other with regard to wheel strength, dropout alignment or... whatever?

Metacortex - Interesting about the variation in OLD for all those bikes. I knew that mine was wider than 120. I just assumed it was 126mm.