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I guess for input you would need a system like on game consoles. It has a-z and then 0-9 and spaces all vertically. And then when you scroll left with the encoder, the vertical list scrolls up, and when you scroll right with the encoder, the list scrolls down. Push the middle button, it advances the input to the right, and then repeat. I think that would be pretty inconvenient instead of just pushing a button.
I think an encoder and a touchscreen would be best.
And if you find a frontend with good keyboard support, then probably good with the encoder. I love RR, but I wouldnt want to navigate by arrow keys and enter only! I have had to before when I cracked my touchscreen and was waiting for the replacement overlay. Worst time ever.
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