Excellent advice! What I did was bind shift-QWEASD to move keys on my alts (as their 2nd movement) and pass shift-QWEASD in keyclone/octopus/etc. That way if I need to strafe my non-tank left, i just hold down shift-Q and everyone strafes left; shift-E for right, shift-W for forward, etc. QWEASD move my main as normal, and those keys aren't passed. Of course I used a /focus based system, I don't think it would work with FTL.

I use F1-F5 to change the group leader and /focus and PiP (changes in under 15ms and automatically follows and all that jazz with Jamba), and I have shift-F1 to shift-F5 bound to a macro that heals that respective person with LHW (every shaman casts it so its 3x LHW in 1.5 secs on one person). So if person2 is suddenly taking a spike damage from impale/etc I press shift-F2 and all the shamans cast lhw on them, something like

/cast [target=party2,help][] Lesser Healing Wave

The only thing is that the target has to be tweaked slightly different if you use target=party2,party3,party4, etc -- I prefer this way since I can swap in new people as needed, you can use names instead to be completely accurate. I just played around with the target=partyX until all 3 shamans were healing the same person.

I have slowly found having one shaman spec resto definitely helpful. There are maybe 2-3 fights where having all shamans be elemental would have been nicer, but for the majority one resto is great. My attack spam button is 2 (castrandom LvB/lightning bolt), shift-2 is flame shock (I open with that), my paladin tank button is 2, so I usually just mash 2 throughout the fight.

My 1 button has the following for my resto shaman:

#showtooltip
/use 13
/use 14
/cast Tidal Waves
/cast [mod:shift target=focustarget,help][mod:shift target=focus,help][mod:shift] Lesser Healing Wave
/cast [nomod target=player] Chain Heal

on my 1 button for my resto shaman. I do not use stopcasting, and on bosses I take out the attack button on my resto shaman. that lets me slip in a 1 or a shift-1 (chain heal) quickly in between attack button spams to get a heal or chain heal off. I also have a seperate key (g) set up as an emergency heal, it does a natures swiftness and healing wave on the tank -- 10-15k instant heal.

Also I highly, highly recommend using Pitbull as a frames addon. It does three things i love:

(1) it clearly shows on your main char the hp/mana of the entire party in a nice tight frame
(2) it shows CASTING BARS for your party, it lets me see exactly and quickly who is casting what on my tank, sometimes after fears and stuff I can quickly reorient everyone if someone isnt casting (facing the wrong way)
(3) it shows heals incoming as a layer on top of party/tank bars, so I can tell exactly how much the incoming heals will heal up for

I've tried a bunch of unit frames and keep going back to Pitbull for the reasons above.