I searched around and couldn’t find anything, but sorry if it’s been said.

A quicksave of sorts, so when you test the engine and want to try some new things, or something like that, you press save, and then quickload if you want it all back to default.

Those are already there in the form of revisions. But if you are trying to say, lets say, changing part A for part B and and quickly testing again, but you decide you want part A back on again, so you want to UNDO the changes, that already has been said before and is being looked into.