I'm curious too since I'm doing the same thing, but with a warlock. I've got my lvl 25 shammy in SM (you can get there at lvl 22 at least), but I'm not finding the exp to be as good as advertised, so I was wondering about knocking out quests with the lock.

I have also considered using the ungroup pet tactic. Does that still work where the lowbie tags it and the ungrouped booster kills it with the pet, doing nothing other than pet damage?