First, love the app. I find VS offers the best visual tracking.. better then other apps. The interface is clean and easy to access. However, I'd recommend a few additions:
PLEASE add the ability to display the voltage on the main screen next to the battery percentage. The percentage is guess by the firmware. Voltage is much more precise.
Alone those same lines, please consider adding more information to the flight screen. It does not need to be displayed all of the time, it could be optional to turn it on and off. Other information could include RC as well as video link strength (only RC is listed) and speed of the drone.
To me, displaying voltage is a must in any drone app.