A 'slide' mode would be great. If I'm swapping out a 2hp module for a 3hp module, having to manually move every module down 1hp is really fiddly. It would be great if I could enable 'slide mode', and the modules already in the rack are 'locked', but I can slide them around and the modules 'push' eachother. Kinda like I do when I'm laying out my rack in real life before I plug/screw anything in.