When in a group, there should be a way to ID enemies (attacking or being attacked) of the other members of the group.

Yes.

Even a simple "switch to target's target" or a "switch to group leader's target" button would help. Then a group leader could say "on my target" and everyone would be on it at the click of a button.

Boy how people forget, I suggested this oh�c about a YEAR ago.

Quite simple. Have a set of buttons that allows you to quickly select any member of your group with one button. Then have a command to assist your group memeber, automatically targeting their target. How it's done in other MMO's can't see why it can't be done here.

I was thinking more on the lines having a "group faction" (for lack of a better term) formed upon group creation. In my opinion, his would be useful for both offensive (BP, incursions) and defensive (mining, trader-escort) missions. In the same way that a normally green target turns red once they attack a single person, they would turn red for the entire group.

The "target target's target" command would be very useful, as a part of this. So would "target target's attacker".