It's hard to believe this MR head been open for over 3 years. I don't understand why they didn't release it in 46 as an experimental feature. I've begrudgingly resorted to using kde again just for this feature.
Asakayo(MR-author) and the others tried to get it pushed through as an experimental feature in gnome 46 but last I checked, there was discussion going on as to how to integrate in the settings page so it is clear as to what the settings do. And before making fun of them for spending time on 'trivial things', do read the discussion that is going regarding the design. Some interesting points are brought up there.
Not a gnome contributor(just a user) but I don't think either request will be merged because usually there is a feature, UI and API/ABI freeze when the beta is released so no new features are added.