You should be able to simply choose NCTE BB from the list of sensors (depends on the firmware version you have) in the PASD-Sensr Type menu. I don't know if the 3.15beta firmware you're using has this in it or not, but it should be in the 3.14 (latest stable known-good release, AFAIK).
It's also possible there's a bug in that beta version causing the problem(s) you're seeing. You can test this by writing down your existing setup parameters so you don't lose them and reflashing the CA to 3.14 with the USB-serial cable (if you have that), then resetting up the CA with your setup. (I don't know how well backing up and restoring the settings with the CA setup program will work between different firmware versions).
Some cadence sensors only respond to forward motion, but they should respond to pedal motion on either side since it's the same shaft and the sensor spins regardless. I don't remember what the one in the NCTE does. I used to use a THUN but don't remember what the cadence sensor did, only that the torque was only on the left side (but it did respond to cadence from either side, since that only requires the shaft to be rotating, and that goes all the way thru).
Does this:
Also CA 'SETUP PAS DEVICE' shows live PAS toggling and torque response to left hand crank but CA display 3 shows 0 Rpm when spinning crank in both directions.
mean that it responds when in the setup menu only, but not when in the regular Display #3 – Human Power screen after exiting setup and rebooting the CA to load the new settings? Does the little "crank" icon still show the pedals going up and down?
If so, it sounds like either there is a bug in the 3.15b firmware, or there is
If the NCTE has enough more poles than the CA can really work with (24?) then they may have chosen 8 as the best divisor for the actual number of poles vs what the CA can keep track of. (just a guess, since there are cadence-only sensors around that you have to do this with).
