Personally I don't really care for the idea that 6/8 is fundamentally different than 3/4 (and by extension the idea that accent patterns should affect time signatures by default), but I'm not going to argue with those who do. To me, the relationship between the numerator and denominator should strictly be # of beats per measure/which note is assigned the beat. Accent patterns need not have a place in time signatures - that's what accent marks are for.