I find that in battlegrounds eventually there are people who believe that if they kill the main they kill the group. Nothing says "represent" when you auto-run then switch to a slave as you take your first hit, then drag your group a new direction, drop a DoT, auto-run, rince-and-repeat.

In my setup I will sometimes enable mouse clone for a moment and right click on the battlefield to cause my group to "disperse", as they disperse I switch toons and drop some DoTs, then hit my leader key to cause them to "converge" on a new leader. By the time the new leader is recognized it's usually too late for them to compensate.

I also have my cursor keys setup to multicast, so I can hit them to break auto-follow. A tactic I've used is to break auto follow leaving your group behind, right click on your target to make your master run into the fight, then switch to a slave and start running into the fight, then tap my auto-follow keybind to coerce my old master into joining my group again. It's a sacrificing move, but if you know you're going to lose your leader anyway it's a good tactic.

Sometimes a little misdirection is enough to compensate for anyone who is "getting smart". If all else fails, and I'm going down too fast to misdirect, I'll simply stop and drop an AoE, switch to my healthiest slave to wreak havoc as quickly as possible (fears on anyone looking to join the fight, bandage my slaves, etc.) Once clumped it's pretty hard for attackers to figure out who the leader is.

I don't use an FTL setup (yet) because it seems like a pain, and so far my PvP interactions have been mostly succesful with a leader-based target-based (or focus/assist-based) approach. Using both toon-target and focus-target approaches I can take on two attackers with relative ease. Fear one, retarget, fear the other, retarget, DoT, retarget, DoT, etc. I may find an FTL approach most useful if I need each toon to retain an indepedent target. So far I haven't needed it.