Ya know I was thinking about what I asked earlier (sharing a tank) and realized that it didnt matter. I would never use one of my shaman as the main in the pve instance, so macros on my paladin don't matter. So the shamans all use the correct names in the macros and so do my druids... the paladin I just put abilities(or macros) on the main keys. DUR, I feel silly. The problem would happen if you wanted to use different tanks with each setup... then each caster would need that /click to work with a different tank.

edit:

big /facepalm! Of course the other guys need to know who they are assisting =( So ya.. guess Im back to using /click or leveling another tank class.