For me, it’s Shared GPU memory.
Can use kinto to change all shortcut on system, even application specific.
How well does it work and how much customisation do you need to do to keep things parallel to Mac shortcuts?
Work very well, almost no bug/failure (maybe 2 year use, popos), has useful tray icon (restart, input debug tool, help, layout change, …).
I think replicate macos almost perfect from start (not remember, too long ago). Except for alt, alt not work like macos for shortcut and key modify, only shortcut or key modify. But can switch shortcut layout and individual shortcut in config file very easy (even has comment what each shortcut).
Only customisation i do make some modify alt instead of shortcut alt and make some shortcut for global shortcut (lock screen, switch to tty) in some app because kinto grab and change input before reach DE. And some shortcut i feel better with.
Kinto use xkeysnail, is full key grabber for x, probably no work on wayland.
