[barts]

Hmm... When I'm at 100%, major grid at 10pt and minor at 1, I am seeing the grid move by 10pt with the arrows, and 1.818pt when I shift-arrow.

I would never want to move things by a half point or anything finer than 1pt and 10pt, so for my needs the differences at the zoom level aren't necessary (but good to know). I zoom in to be able to see the 1pt move more clearly since it's a little hard to see how things line up when I'm zoomed out and there's a border around the selected object.