I play 2x Pallys and a DK or Shaman. My buddy plays a Shaman/DK/Warrior

The trick is to either A) setup your sequences in macros that overlap keys. You might have a dps macro and a healing macro... remember to put your dps macro on both those keys for toons that are not healing.

The other option. Is to pick abilities with similar cool-downs and bind them to the same key like Crusader Strike and Storm Strike (The old talented version)