1. Yes. To test mission 2, make it mission 1. You can drag and drop the missions in that top bar to rearrange them. It's not intuitive, but it works.
2. The destination is always the exit. I get the feeling from the way the help text is phrased that they were planning to make it possible to have other destinations work, like we sometimes see in regular missions, but apparently that feature didn't make release.
3. No, you can't. The only contact is the holo contact, and it can't change during an arc.
Avatar: "Cheeky Jack O Lantern" by dimarie
Thanx bunchez
If you are making a mission arc, can you test mission2 without having to complete mission1?
If you have an escort betray on arrival to destination, how do you set the destination?
Can you not send team to different contacts thru a mission arc?