My feature request would be a “Tempo Pedal”. Just like you can plug in the footswitch pedal, imagine if you could plug in a volume pedal, and use it to control tempo. I play in a group where the lead wants to change the tempo through a song, particularly at the end. I’d love to be able to slow down the tempo on a song by “backing off” on a volume pedal. Oh yeah.
You could even have a fancy expensive new add-on, a “Tempo Pedal” that also had an LED readout of the tempo. Oh yea.