I personaly prefer a modified "ftl-Aproach" (focusless,targetless,leaderless) from Pocalyps & Co. but this is pure personal choice.
How have you modified your FTL setup? I just implemented this method over the weeknd and the only chance I had to try it out was in 3v3. I lost, many many games, but I don't blame it all on the FTL setup.

My big problems with that is the 'leaderless' part when it comes to controling the toons. Specifically, how do you configure spread out macros and non-active-toon turning and movement?
My 2nd major problem was with using a modifier key with a keybinding to do a main ability. I was already in the habit of having lightning bolt on the (W) key and Chain lightning on (Shift-W), so when i went with that setup and changed leaders the (Shift-W) didn't send to the other wow instances properly. The fix that Deceased suggested (toggling - Pass hotstrings only) caused a major headache because now I can't send anything to the other windows without making a hotstring. I couldn't figure out how to make a formation with the hotstrings.

Overall I was blown away by the ingenuity of the whole system, and the seamless transition from toon to toon, but dealing with formations and non-active-toon movement was a problem I couldn't solve unless I reverted back to the old setup where i had a main with different keybindings than the alts.

I'm still up in the air on the FTL system, and I hope to see more discussion and comments about it here on the PVP front.