Basically, in Inkscape, when you hold Shift while trying to drag an item, it does so in a straight line to the left/right/up/down without moving diagonally at all. This would be great in the GFUI when lining up multiples of the same object. When doing this manually, sometimes they are offset a bit up or down, which I think increases the amount of time it takes to cut/engrave as it sometimes travels between them a bit awkwardly.
Otherwise, no major complaints.