Did i got it right, that v1.72 is able to play two sonds at a time? Then why not putting either enginesonds in the background or (suggestion) some kind of computerbeeps... i don't know how realistic this is because i don't know how much is possible with the Oolite-engine. Something like beeping, buzzing, humming in the background, that goes more nervous as the action builds up in a fight and tones down if you are in a green status.
Regarding ships i would like to see some Sci-Fi-Stuff like:
LANCET - in the roll of an escapecapsule, taxi, shuttle.
ORION VII-X - military, police, trader.
As we have now ships from "Star Wars", "Star Trek" and such it would be nice to see them, too.
Just what i was thinking about...
