I have done a few quests and it does work. I have no idea how to make it easy though. In some cases the toons have to be right on top of each other (e..g, possessing a giant). I still need to figure out how to bind keys to the possession bar using Bartender. I believe it can be done, I just don't know how.

You can try the daily in Dragonspite. My first attempt at that was a disaster, lol. My toons ended up all over because I wasn't paying attention and hit Numlock or something.