For Lifetap, right now, I just have a key bound only to the locks. They are also so low, and it returns so little mana, that I don't bother to use it in combat.

Later on, I will need to do something like that. I wonder if I can change targets in a castsequence? I don't think that is allowed. I will have to test it out at some point. If it is the priest's macro would look like

/castsequence target locka renew, target lockb renew, target lockc renew

If that doesn't work, perhaps using /click will. Make a renew macro for each toon placed on the action bar. Then do

Code:
/click [button:1] MultiBarLeftButton2; MultiBarLeftButton3; MultiBarLeftButton4
In theory would work, based on Cogwheel's sticky Macro FAQ (post #15) on the WoW forums. Either way, it needs some testing.

Thanks for the idea!

Yea! WoW is back, time to test!.