That one knob could be a really short joy-stick type device. Giving you 5 different inputs: up, down, left, right and push. Or even 7 if you can also turn it ea

That one knob could be a really short joy-stick type device. Giving you 5 different inputs: up, down, left, right and push. Or even 7 if you can also turn it each direction. (we have a 7-input knob for the navi in our car.) So depending on how you mapped those movements, you can achieve all the actions you want.