Improvement to KiCAD Schematic Library Editor

This will be the source of terrible mess. I think the current approach is good.
We only need to create less “universal libraries” - for other devices than base devices like: resistor, capacitor, diode, etc. - which allow to select any footprint to symbol.

Sorry, I don’t get it your idea.

The library editor really needs a side panel. How to make Eeschema library editor much better - Wishlist
On this panel you could dynamically view the information you need at the moment by extending or hiding floating tables.

I agree in 100%.