I've never used FTL systems before, but I've never had a PvP team and have just gotten used to using /follow and /assist keys bound to my slaves...able to clear all heroics with this method, cumbersome as it may be. However, I am now bringing up a 5 Shammy PVP team and have decided I had better embrace the FTL method if I want to be effective, and eventually I would will want to include it in my PvE team. I do however have a question regarding your write up here.

I see you have one button for for the slaves to target your main and follow. I will not need to mash this button everytime I change targets will I? Although I realize in PVP there will be a requirement for much more movenment, if I have my slaves positioned, I do not want them to follow me everytime I change targets. I know this may be self evident from macros you have created, but whenever I've tried to decipher exactly what is happening with the macros in a FTL system, my brain starts to hurt.