I dont know if its possible but would there be a way to have a new column on the faction interface saying when a person was last active? because factions always invite new people, and need to kick people that aren't on but they sometimes make mistakes.
That's why there are titles and merit. Also frequent refresh of guild list is helpful also. Then there is who is the most active on the chat (you can remember people by that too).
I'd rather want this feature on friends list