It seems trivial, but I found this two-step menu reveal (see video in link) annoying when I had to change a lot of scenes. Part of the menu appears, there’s a delay, and then the rest of the menu appears. That is, I just wanted to click and select rather than click, wait for the option I wanted to be revealed, then select.
If you want to assign the same label to several documents at once, select the documents in the Binder, then right-click and choose the Label menu item.
I’m not sure, but I think the menu display behavior is built into the Mac OS interface control we use. I’m not sure it’s something that Scrivener controls directly.