1) Our discussion about starts has relevance to leaving after a pit stop.
2) All the teams have a system for accurately setting the grab point of the clutch. It probably makes its last evaluation of the clutch and starting spot track surface condition leaving for the parade lap. This provides a very consistent release curve for the driver controlled clutch paddle. It would be very easy for the teams to have a start simulator available at the track for the drivers to practice on. In the end the start is all in the drivers fingers. This is probably a well practiced activity.
3) Other than fuel economy and the throttle to pedal interface, what would be the advantage of changing the engine map? There is no reason to have a different map for low rpm's. The average lap does not see low rpm's. One map could have the correct optimization for both high and low rpm's.
In some conditions, such as rain, you might want to soften the engine output curve, but is that necessary for the start?
Brian