This is old but as I work to install an I/O expansion on my non-rusEFI setup I realized the MS solution to expansion is a FW change in there microsquirt....ECU-I/O expansion-TransControl
Is that something you guys are thinking about, might be thinking about, or already have and I didn't see it? I did see talk the the WB control might be CAN friendly.
With CAN up and running the options become nearly limitless I guess..the motec crowd mounts the ECU then a PDM (power distribution module) front, back , middle so installing new stuff becomes dead simple as power, ground, signal are never more than a few feet away. I've not really gotten on the train yet but did include a CAN line to the front when I built my wire harness should the time come when I step out of my hardwired world.