I have no idea, but frankly I just use the list and filter in the actions menu & either search or just wade through.
I admit it IS one of the reasons I find the actions list a bit of a pain from time to time, but once you have a bunch of stuff set up on your system with the necessary shortcuts, you`ll spend a whole lot less time hunting through the list.
Maybe we should do a feature request for a slightly more compartmentalised list in the actions menu?
Let`s hope someone comes on here with a way to do this already!