I think mixing some of those ideas would make for something interesting. For example, something amazing could come out of a thread mixing #5 and #8.
Scenario example could be like this: A ship holding valuable cargo crashes on a hazardous planet and sends out a distress signal. However many participants in the thread will determine who all gets the signal and investigates. After all the participants investigate the crash site and discover each other, tensions rise. Participants discover the great worth of the ship's cargo and react however. Since everyone should be inside the crashed ship, they do not realize the threat of an approaching storm. The storm traps everyone inside the downed ship, making tensions rise even more with everyone being strangers and the mass amount of wealth surrounding them. (I'm thinking that the storm would have to be one of a colossal level, meaning that survival without shelter is unlikely.)
That would be just an example, could bring many scenarios from something like that.
Anyways, if I had to pick only one for [member="Zayden Madera"] to do, it would have to be #5. The one about the storm.