When you use the IWT you need to ensure you have click to move enabled on your slaves (In WoW go to your settings and its under mouse) this will cause them to turn and run up to smash stuff. keep in mind though that (Except for hunters) any toon that you hit IWT on while click to move is active will result in it running up and hitting the target. So what you can do is
Target mob
Hit IWT target button
Wait until all toons moving
Hit Back on all your toons to stop them moving

Pallys I found were easy mode :P The only abilitys I used (Besides buffs and auras) from 1-60 were

DPS and Tank
Judgement of xxxx (I had them use different ones to improve synergy)
Consecrate

Tank
Rightous Fury (On my tank, as he is using the same abilitys as my DPS ones he always ended up on top for threat)
Avengers Shield (Once you get the talent its great for pulling)

Heals (Sometimes I had it also using the DPS abilitys but stopped that as I didnt need the extra DPS)
Flash of light
Some instant cast heal
Lay on hands

This setup was great with judgement of wisdom and my healer also hitting the targets mana was rarely an issue, I could round up huge numbers of like leveled mobs and just take them all down with 4-5 consecrates and to break up the tedium you can jsut jump into a random instance whenever you want and get some shiny gear at the end of it