Shortcuts makes more sense now.
After changing an unwanted QV shortcut to None, I used Refresh and noticed all the Main Window Layout shortcuts had changed None

Quit CCR tested the shortcuts (phew still work), restarted CCR and they were there.
I've spotted an anomaly with the shortcut for Scroll Book Details. I think it may be the same glitch as to why CCR isn't showing None as the default. If you can do a version with a Shortcut (e.g Shift+Alt+C) and attach it to a reply here I'll confirm whether it's the same glitch, then whatever solution Bradles comes up with for SBD should work for you (SBD is tiny 100 lines of code, 50% comments)
I think I can see maybe what was intended with plugin Category (IMO "Source" would be better name for the column) —
Built-in, or
Plugin Updater, or
Other. If it had that, then maybe there'd be no need for the Install Type column.
The plugin list has a True/False column for
Can Disable, but lacks a column for
Is Disabled
BR