Pax,
I agree it would not be very groundbreaking, but does it really have to be?
The salvage crew could have weapons, even military stationed there.
Now the "problem" is the movie would be more like A2, and that is about the only problem.
Keep in mind it has been 21 years since A2 came out. So is it really a problem if the movie has a similar plot and theme?
I would hate to see a "re-make", so I thought up a movie with a similar theme, but the story is slightly different, and it would end up being a similar feeling movie, but with new characters, a new ship, same aliens, with more special effects techniques to bring the aliens to life than were avialable in 1986.
We could add in a new sinister human bad guy too. More active in his role than Burke was in A2.
My take on this is that for modern movie goers, Aliens feels dated. I still love it, and so do its loyal fans, but most movie goers with ADD today just would not be able to sit through the slow moving parts.
The old story, or theme, could be updated, and given a polish, and made again, to terrify this generation the way A2 did, while also giving the excitement too.
I would not want a re-make of A2, as it has a very solid place in the continuity.
That is why I came up with an idea that although fitting with the Alien setting and conservative in not messing with the Alien lifecycle, it is still nothing really new. It is a very similar event to A1 and A2, sort of an in-between like when the Aliens took over Hadley's hope.
It is hard to do something really new, as the Aliens have an elegantly straightforward lifecycle. We learned after A:R that messing with this is a bad idea. You can provide different hosts for some new variation but they are still regular aliens.
New castes of aliens or mutants cannot really be added as they just ruin that elegant cycle already setup.
If you can think of some good changes to add in here and there to the rough story I just posted before this; I encourage you to do so.
Maybe if we combine some good ideas we could come up with a good idea for A5.
Some general guidelines I like to follow:
1. No Ripley, as I think the creatures are more of a draw than she was.
2. No messing with the Alien lifecycle with mutations like the "Newborn"
3. Each stage of the Alien should be represented in the movie.
Have at it.