Your heart beat assist mode would be an extremely useful feature for me. Can you please add the possibility to your ECU OS to use different heart rate sensors? Not all of us do have an Apple Watch or similar. I am using a Bluetooth heart rate chest belt which is much more reliable when biking than a smart watch and uses extremely low battery power. One small battery cell lasts at least a whole bike season or two. I suppose these belts do have a standardized protocol as until now all of them I tried could flawlessly communicate with my iPhone app (runtastic MTB pro). I think such a feature will be easy to be implemented
It could be great to use the smartphone or smartwatch as a key to unlock the bike via NFC just like the new electric cars, you can also unlock with the original key or the new ECU!