It would be nice to be able to adjust the camera in Litchi. My process for using Litchi (or Airnest) is this:
Use Go to check sensors and drone status. Once the status comes ready and the sensor values all look good, I fly the drone over by where the first waypoint is set. I try to match the location and altitude. Once there, I setup the camera's exposure and usually yaw the drone around in place to get a feel for the overall exposure I will get.
I then aim the gimbal at the point of interest. I then set the remote to F mode, quit Go and start the 3rd party app (Litchi or Airnest).
Once there, I load my mission and run it. So, without any further ado, here is the video: