You probably know this already, but I'm saying it anyway (hope you don't mind): The intuitive keyboard shortcuts would be win-right-arrow (then) up arrow for the top right corner tiling, like Windows does quarter tiling.

Also, Gnome (half) tiling has the windows sliding, your extension jumps them, and requires extra button (ctrl) ootb.

Very small things, and I will for sure keep the extension installed and use it, thank you!