Well, on my setup I use click regions for heals wich make my healing as efficient as any other healer.
For dps I've just put a /castsequence macro on the 3 elementals on button 1-5 wich basically just assists whatever I am doing on my tank.

On my tank I stick to using button 1-5 for basic tanking skills and alt/ctrl/shift + 1 through = for abilities that I just want my tank to do.

Button 6, 7 and 8 are set up with the class heals that just do selfheals.