Thank you for the feedback.
1. I'm unaware of "set return home in the advanced settings" in FPV Camera app, or you are referring to DJI GO app? In Mission Planner, you may set Finish to RTH upon completion of mission (as shown below).
Can you post a screenshot to show "the value of the slider is all the way left and no number displayed"?
2. If the app crashed during mission flight, you don't need to take over and the mission will continue though Auto-Tilt is disabled. Simply relaunch the app to re-enable Auto-Tilt and keep monitoring the flight. Please post the video to share with us.
We plan to add "Email" feature to send mission files by email as backup or share with friends. We are exploring to sync mission files across iDevice via iCloud, but this is not the priority at this stage.