It could be useful to have a way to search and know if a specific key or shortcut has some kind of action.
There could be a search bar in the Keyboard shortcuts panel where we would just press the key and all the shortcuts for it would show (a bit like After Effects - best shortcut tool).
Or it could be in the “Search tool(?)” (CTRL + P), and we could write +z and it would show all the shortcuts with “Z”.
It would complement perfectly the Customizable shortcuts