Will it work to have several waypoints in the same place so I can have the drone do multiple things at the same spot?
From the Litchi Waypoint Help page:
Actions are performed when the aircraft arrives at the waypoint. There are six different waypoint actions, three of which accept an additional parameter.
You can add up to 15 different actions for each waypoint.
And this info might help too:
But will it stop at each waypoint?
Yes, as long as you have the Mission Path Mode set to Straight Lines.
All of this is on the Litchi Help website.
Ah, missed that. I saw the “stay” action and thought it was always needed.