I assume that left joystick up/down is axis 1, correct?

What would you suggest as an alternative?

The Godot engine GUI is also made in Godot.

How big is the context window for the free version? I haven’t found any information about it.

https://docs.helix-editor.com/remapping.html

Is there anyone that you would recommend instead?

I use stars to keep a list of repositories I'm interested in. You can even put them in different categories, like browser bookmarks.