This is a command on other servers I've been on and it pretty much works like this, when your pvping anyone in your faction (maybe it could also be a perm for who could use it) types /focus (player name) this then highlights the focused players name above their head in a different colour then everyone else's for everyone in your faction , therefore if I was to focus someone everyone in my faction would see that players name in a different colour (not sure what the colour should be, but something that stands out) this then makes it easier for the people in your faction who are pvping to focus down the focused enemy without them getting lost in the crowd of pvpers.
Just a little idea that could work
Just a little idea that could work