Feature request: rebind keyboard, as well as alternative control schemes

[User670]

rebind keyboard, self explanatory

alternative control schemes... instead of "use one set of direction keys (arrows) to move cursor, and another set (WASD) to swap", I'd like to "use one set of direction keys to move cursor, press a confirm key, and use the same set of direction keys to swap". Eg, if I want to swap the top left gem to the right, I'll use up and left to move cursor to top left, press space, then press right to swap.