//undo and //redo

[hf02]

Maybe these commands could be put in some special place as they don't modify the selection like the rest of the commands do.

Another idea is that there could be an option for it to only undo Scroll for WorldEdit's changes, so you can scroll while being confident you're not going to undo something major. However, I'm not sure how it would even detect what would be a change done by Scroll for WorldEdit.