Ejector seat and / or parachute deployment would be nice…
But to be completely honest, whilst I use Strava to log my rides, I kind of hate myself for it, I also listen to the music player on my phone when I’m riding alone, sometimes It’s useful when ‘Christmas Time (don’t let the bells end)’ comes on in the middle of June (WTF haven’t I deleted that yet?!) to be able to skip to the next song, but the little do-dar on my headphone lead does that.
Perhaps smartphone remote isn’t the way to go – have you considered a programmable generic Bluetooth device – when it comes to MTBers the phone is generally just for emergences, or for strava – two things that you don’t really mess with whilst riding – BUT some people like to start-stop a action cam and/or piss about with their GPS device you might find a better market for that…
But as I think you’ve found already, MTBers can be very anti-tech, at least whilst they’re riding anyway – the thought of being able to make / receive a call when I’m riding fills me with dread – it would be like someone slapping you awake in the middle of a nap to remind you, that you have bills and commitments – we’d rather forget about that crap for a few hours and concentrate on dodging tress and shit.