I was recently speaking with someone about snapping. We both had desire to use snapping is such a way that all lines would be snapped to a 1px grid effectively eliminating the anti-aliasing. But we wanted to do this zoomed out to a distance where a 1px grid would not be visible. With your proposed change it would be impossible to force positioning to a grid while zoomed in with out going back to the prefs to set the snap distance.
I don't quite see why it should not be possible... when zoomed out, to let's say 100% your 1px * 1 px grid will work with snapping without any problem. When zoomed in you need to move your mouse a little closer to the line than before to snap. What's the drawback? Maybe I just can't see the point, because I'm more used to doing graphics, but this sounds like pixel alignment to me, and I'd for that task still desire the proposed behaviour.
Please give me a chance to understand your point, Aaron and Josh.
David