How about a selection? select all the crappy damaged metals and eject them.

I think it's worth keeping a key to eject everything too.

I think jettison should eject only one piece of cargo at the time, I've often picked up crappy unit from one of bots that is worthless instead of my precious nanite and could not get it back because all boxes look the same and you can't eject one or another widget.
Simple solution would be to keep cargo as a stack situation. last in first out. So when you pick up a worthless unit you can eject it straight away and replace it with something else.
This is extremely easy to add into the game and would be very useful.

oops double post :/

oops double post :/

no need to go in such complication as specifying what you want to eject. stack would suffice.
and if you want to eject everything, just press j 12 times.

hit j, it will ask you which slot, hit 0-9, that type of cargo empties, of course this would override the select weapon group buttons for a second or two.

Also, a destroy cargo key, so i can just patrol the frigate death zone in my prom and pick up the junk and destroy it, then pick up the good stuff.