In my opinion this drone thing is a nonsense alltogether. I tried what you suggested, with" translate Drone forward" and “translate drone backward” , I get the plane move away and move closer. If you use " toggle drone", then you also have to use " toggle drone follow mode", otherwise you are in the wrong movie and the plane flies without being controlled. After a while ( a day or so) you might give up.
It only needs a few commands, one that let’s you" move away from the plane" and one that let’s you “move toward the plane” ( these are not zoom commands), and commands that let you" move around the plane", when in" External view mode".