I use yEd for sequence diagrams, among other things. Sequence diagrams have lots of activation segments (segments along the vertically dotted lifeline), with horizontal arrows going to other activations. I have to adjust these manually, but each time I adjust the height of one of them, all the edges connected to it move around and I have to select each of them in turn to make it horizontal again.
I'd like to have an option to leave the edges in their current position (unless, of course, I shrink the node, in which case edges pertaining to it could move up and stay horizontal or could simply adjust and become tilted.)
Perhaps Alt+Resize could do it.