Q1: Tapping on a point makes it disappear.
"Boundary Markers can be single tapped to be removed or tapped and held again to be moved."
Q2: There is not one. Most apps don't have this.
Q3: Map Pilot does not allow the use of interior points to create a concave polygon. Since we see all of the data that gets processed we see that they do not tend to process very well. You can force taking areas like this by flying multiple missions or by snaking the flight around using our Linear Planning tool but we don't recommend it.
Q4: We answer all support and forum questions within a few hours.