I run into a rather interesting problem when dealing with small selection sizes: The distance considered to be in the area of a selection node (7 pixels) uses logical pixels. That is, if you zoom in 200% on an image, the physical number of pixels that will be considered within distance of a node is 14 pixels, or logical/apparent 7 pixels. This makes it impossible to move small selections, as zooming in doesn't allow you to move a now logically larger selection box. I think that mouse distance-to-node should be handled in a physical matter (like most other image applications), so that if you zoom in on an image, you will eventually get to the point where you can move a small selection.
