First up; I have type three Ehlers-Danlos, which means that my joints randomly dislocate, and I take huge amounts of analgesia. Sometimes I have to deliberately take a larger dose than I am supposed to to get home if I don't have my wheelchair with me. This leads to episodes of confusion. So a nice big simple In Case Of Emergency button would be exceptionally helpful if I fall over or get too out of it. Additionally, the ability to have it remind me to take medication would be helpful. The ability to pull up Maps and navigate without having to pull out a device; it is not easy to defend myself. Finally, robust remote media controls for the paired phone or tablet. When I pass through crowded stations, particularly Westminster or London Liverpool Street, in my wheelchair, I occasionally get absolute fucking morons walking into me, despite flashing lights on my wheels and on the crutches on the back of the chair at about head height. To deal with this, I keep a set of quite loud Bluetooth speakers mounted to me chair, and blast metal as I travel. This also motivates my pushing. The ability to easily control this from my wrist, without having to dig into my pouch, would be very helpful. Oh, and telling the time would be a nice bonus, too.