A good way to use the new multiway to use a single switch wood be to get a plugin like this one Multi Button to CV - MOD Devices, but with a single CV output, so we can have a 3 position expression foot switch.
The Multi Button to CV is the way to have 3 different footswitch in a single one.
This plugin would be the way to have 3 different state of one single switch, like a 3 position expression pedal.
The plugin would control :
the 3 voltages (one for single-press, one for double-press, one for longpress)
the time to get slowly from one state to the other
I believe that this is already possible using an arrangement of CV plugins. @jesse can you confirm this? I think you will know the perfect answer (I would need to dig a bit)