It's a duplicate if you're counting similar requests formed within my head. So yes, I would appreciate this. There are also cases where you want your 1/2s to have a slightly higher DS than your 1/1s to prevent them from touching each other.
About using the 'multiple hotkeys' option: That'd be nice, and could even be definable at the Options menu or something (along with the distance spacing the hotkey will use).
BUMP Still want this. It's very annoying when you have to constantly be switching between two distance snaps. It happens a lot when you have the 1/4th spacing different than 1/1 and 1/2th spacing.