Bring back the magic: cascading menu quick-access ANCESTOR

KDE gives me a cascading menu if I want one, and I most certainly do, but it abuses my desktop with white-space diarrhea. In desperation I created a UserAdded menu entry to get this:

Nothing wrong with emptyness on a desktop, but a menu is not desktop. It’s more like control-panel and THAT is real estate where every pixel is worth a million. Having to slide three parsecs across my monitor wears out the wheels in the laser mouse.

No, what “I” want is exactly what the subject field says, the original RealMcCoy, maybe with even more customisability like defining if items in a folder are OK for single click or need the discipline of double. Here’s what I ‘remember it as’:

Assume that the + icon is the icon for the widget, I used mostly folder names to make tree logic, etc. I had a canned folderful of mountpoints for up to 20 every partitions on each of 4-6 disks and I could mnount or unmopunt them in a couple of clicks. Some were other scripts like ‘fdisk -l’, or start/stop apache, etc.