I am going to enter yet another plea for hardware slew controls using a joystick/gamepad/etc after trying with several brands of bluetooth controllers with no success... because I can't stop thinking about how great this would be for a few reasons:
• proportional slew rates: we have joysticks that can do this, lets have the software and mount do it too! even at just half the speed range (say one for changing targets and another for fine tuning view) 2 -3 different slew speeds depending on how far the joystick is moved would be SO much more efficient than selecting new rates.
• ability to hand a simple controller to guests at outreach - great for moon viewing. "Here..have a look around"
• Direction reversal and field rotation compensation!
This last one would be huge: if I am able to hit a couple toggles and either pick an arbitrary rotation offset or better yet have the software work out based on mount type and target location how to interpret and apply my input so that a left command on a joystick/D-pad moves my subject left in the view, regardless of mount angles, diagonal image flip, etc....this would be a feature available NOWHERE else, and would make us visual people very happy.
Slewing is single biggest reason that I so rarely have my mount connected to Sky Safari: with a SynScan mount, I lose my hand controller and any hardware controls is exchange for the WiFi dongle, and must rely on whats available in software (switching back requires power cycle, re-alignment, yadda...not a minor hassle). This is out of the question at start parties and outreach when there's a line of people...I need those slew controls and can't be hunting around or reconnecting an app. I would so much rather connect up Sky Safari and just stay there with a nice little BT remote for an entire viewing session....I would gladly buy the app(s) again for this feature alone.
(for context: Sky Safari iOS and Android seem to both understand direction input in my experiments but only pan the view around. Neither move the scope nor give any option in any settings I can find to choose that instead of panning the view. I will never need to pan the view on a touch screen device...I would so much rather have good slew controls)