One of my biggest gripes with the default action bars. Aside from no mouseover, is the way it displays the keybinds. This addon fixes that but why cant this just be the way the default UI is anyway?!
https://www.curseforge.com/wow/addons/keybind-text-shorten
Good luck.
In the default UI, there still isn’t a combined bank option 3 years after the revamp. Or coordinates. Or a way to lock the Personal Resource Bar. Or the ability to move class power off the player frame. Or a scaling option for nameplates (either only tiny or giant). Or any of the 30 common-sense tweaks that the Plumber addon does to the UI. Or, or, or.
Blizzard will always provide half-arsed options and customization; niche stuff like your suggestion isn’t anywhere on their radar.