I'd like to see a "shoot using timer" button added to the Flats image calibration screen - "shoot" and "shoot with timer" buttons could be side by side on the flats screen.
I'm thinking of a scenario where you select flats image calibration in the seestar app, use the joystick to move the scope into position for taking a flats calibration, then selecting the "shoot with timer" button which gives you 30 or 60 secs to open up a separate tab on your smartphone to access the white screen website or white image in the cameraroll, set the smartphone screen brightness to a proper level, then set it in front of the seestar lens before the calibration routine is executed. After you finish hearing the flats calibration clicks, you remove the smartphone from in front of the lens, go back to the seestar app tab, and check the message to see if flats was successful or failed.
This "shoot with timer" would allow you to use the same smartphone for flats instead of needing two (a seestar app phone and a white screen phone).