You are welcome.
A text at the target frame is okay but noone else will see it, only you will
Same proble there: If you aren't grouped you cannot show that info to other players (via LibMapPing e.g.).
Maybe using the guild notice (per player) would be a workaround for guildies. But you shouldn't change that too often as the server will kick you for spamming else. Even if you only change a few members after another it could happen/happend in the past.
And there are so many addons adding text there already, I doubt you'd get lots of characters left :-p