Install / make your own watch faces.
Blood glucose monitor.
Infrared transmitter so I can turn off/change the channels on the stupid TVs at airports, hotel breakfast/coffee areas, or anywhere else I’m bombarded by screens.
Emergency distress beacon like the Breitling Emergency has.
High speed saw and a super magnet like James Bond had in his watch.
Okay, I might have gone off the deep end, but the saw and magnet would be super nice to have.
Oh, almost forgot, the ability to update the watch OS with it not being on the charger when your battery is at 100%. (We will make it say 80%, but I’ve literally took the watch off the charger, put the watch on, and saw an update was available.)