I find that I frequently use the keyboard to precisely locate elements in my mockups. This is often because there are many other elements that may get snapping or alignment preference.
I would greatly appreciate being able to move an element by 16px. (Currently this requires nudging by 10px and then by 1px six times.)
Perhaps CTRL-SHIFT-ARROW could be the shortcut to nudge by 16px?
(Alternatively the snapping distance could be brought into line with the “long” nudge but that might be problematic for historic mockups.)