I've never done cross realm grouping before, aside from dungeon finder, so I don't have any knowledge of how it works. Do players have to be in the same battlegroup? How does one form a cross realm party? If you can let me know more about the process, I can try and setup a test team to look into how this would work. To set expectations, if it isn't reasonably simple, I will probably pass on adding this as a feature of the addon.