I got on the FM9 waitlist because I saw that it looked like I could run my piezo pickup in a separate signal chain and run that and my magnetic pickups through the same unit in separate paths. I have been doing this with two different solutions and would like being able to do it all in one floor board units.
That would be a game changer for me too. At the moment I run my Parker Fly and PRS P22 with one output going to the front of my Toaster for the magnetic pickups and another output going to the return input as the Return of an FX Loop in Stomp A. I then use Parallel Path to send the Piezo through one FX (usually Reverb) in Stomp B. However, this is extremely limited as normally I would want a Compressor, EQ and Rev on the Piezo signal (an acoustic profile would be even better but that isn’t technically possible in the KPA). I have been seriously thinking about adding an Aura or an LR Baggs etc to get round this. However, just being able to use more than 2 Stomps on the Parallel Path and/or blend it back into the main FX chain post stack would let me use the KPA as a stand alone solution.