I find the defaults to be mostly satisfactory, except both Mark as "remembered" and Show next side of card share the same keybinds for some reason, SPACE. Would be great if this could be changed, or at the very least if an alternative key was added for marking a card as remembered. There already alternative keybinds for flipping a card over, but none for marking a card as remembered as far as I can tell, so this seems like a strange oversight.