Yeah, I usually need to bounce ideas with other people a bit before anything really happens in my brain!
Mal - I do think Jack might have joined him in his drunken depression at times. The prospect of being stuck here *forever* (or at least for a really long time, because presumably at some point someone would find the real prison and rescue them!) would hit him hard. Spending over a century in Cardiff waiting for the Doctor, knowing it was going to end and still being able to travel if he wanted to, even if it was only on Earth, was one thing, but being stuck in a tiny dome with a tiny, unchanging population for potentially thousands or millions of years? That's quite another!
So, yeah, I think he would have joined Mal in trying to drink the dome dry at times. Probably wouldn't have been much help to him, really!
Martha - I'm fine with whatever way your thoughts go. :-)