i have:
pally - tank
priest - healer
mage - dps
shammy X2 - dps

and the only "trick" i have found to use more abilities than lightning bolt + fireball is to set up spells that are exactly the same as far as cast time, like i'll put instants (fireblast) with another instant (shadow word death) and forthe shammys (shocks). besides that it's hard for me to do anything, but i only pve so far, i did try pvping once, but a single rogue took down my whole group single handedly, he was good and knew just how to strike a multiboxer, he would sap my alts, and i wouldn't notice and he would kill that one when the rest of the group was gone, and over and over and when he got to my pally i just let him die to get back with the rest of the team.