Yeah… All the tools in Linux are going to do this weird thing where they expect it to behave like a normal key. So you’d have to do all the hacks mentioned to make it work. For example, GNOME keybind stops detecting the key bind when you release. Etc. Maybe the kernel will accept a “broken copilot key hack“ that implements it but it’s not good.

Even with hacks, it still won’t work like a modifier like most people use alt/ctrl/win because those rely on knowing the key up to see multiple keys pressed together before release. So… Broken.