Trivial, I know, but had the undo/redo buttons been more visible in WinBox, I would have surely taken advantage of it.
I suggest adding the words "Undo" and "Redo" to the buttons, and move them to the right, so they're positioned above the work area, like this:
I've already added it to the bottom of the Not Yet Implemented section of the RouterOS Feature Requests list on the wiki so you can add your vote, but thought I'd post here as well, in an effort to drum up some quick interest in it.
I'm also interested to see how many others didn't spot this in WinBox and didn't read about it on the Wiki. Hopefully I'm not the only one.