Now that I better understand its intent, I'm using All actions as my secondary navigation tool - keyboard shortcuts being the primary.
Q. Are the outer branch range names fixed or are they determined by how many.
When I had 10 plugins installed I had a branch node "BR Menu - View Manager" with 10 leaf nodes, when I removed a plugin the branch node disappeared and I have 9 leaf nodes in the outer menu. I'd rather have a branch node, even if it only has one leaf**.
Incidentally I had to restart calibre to have the removed plugin disappear from the All actions Plugins menu. Aside: removing a plugin should offer a restart, like a adding a plugin does… IMO.
Anyway, some suggestions
- Use '→' rather than '-' in the outer branch names e.g. Add books→Choose library
I have to remind myself that they not connected actions - i.e. 'Add books - Choose library' does not mean choose the library to which books will be added.
- Include all the Preference panels as per the lower section of the Preferences drop down menu:

- Add another section - Libraries.
BR
** ATSCS - Acute Topographical Spatial Consistency Syndrome