It would be cool if one could assign more than one actuator to plugin parameters. So, for example, we could use a MIDI message as well as a footswitch to toggle an effect.
My use case is like this: I use a MIDI controller to manage presets for my entire guitar rig. A preset change sends CC messages to the Duo to turn certain plugins on or off. But still I would like to have the option to toggle effects manually. Even the visual feedback from the LED whether the effect is on or off would be a great improvement.