I've been running a fair bit of Classic Traveller over the past few years, and have wondered about your issue but have never had to make any decision about it!I’m new to running Traveller and am looking for advice.
I like your approach. Maybe throw 5+ (with a negative DM = damage dice of a firearm; maybe no or a reduced DM for lasers) to avoid a negative consequence of a missed shot. EDIT - negative DM for high energy weapons should maybe -5.
I don't think this is necessary. I like @werecorpse's approach of just making it up!It seems to me you would need to know what equipment / control panels are available to damage in a specific area.