yeah… it would also kill two birds with one stone… the people that don’t want snaps to happen on points ‘behind’ objects… the all time surface snap would have precedence over other snaps… so an end point which is behind a surface wouldn’t register…
ie-- it would solve this:
http://discourse.mcneel.com/t/stop-object-snapping-to-stuff-behind/7416
in rhino, it would be better than the comparison application (sketchup) because ‘surface’ would be an osnap setting which you could enable/disable… if ‘surface’ is on-- it won’t find snaps behind a surface… if it’s off-- it will act as it currently does… and personally, i would use both.