Zellij always permitted to change all the keybindings… On the discord peoples asked for Alt as default modifier, and shared their config default locked. That what motivated the maintainer to include this sort of configs. With this version zellij implement the kitty’s keyboard protocol, which should enable to use more key combinaison (if your terminal support it). I’m not sure about multiples modifiers, I haven’t installed it yet.

I’m not sure what you mean by “not being able to lock floating windows on top”.

I know simple fossify apps are appreciated by the comminity. I have yet to try them. I like Etar as a calendar. It is also on FDroid

Where can I learn what each colors means? Is it buried in man htop somewhere? Or in a website?