I must admit that during FEAST2 I did not have similar priorities on the five tasks at hand. Sure, I attempted best I could to complete them all, but I still had a priority list that went: Audiomessages > Sorting > Insert new > Local conflicts > Removing slides > Opposite conflicts.
Basically it meant everytime a message came I stopped what I was doing to listen and insert the info. The sorting was easy and maintained and inserting new slides wasn't that hard either. Everytime a change occured or a new slide was inserted I checked if they created any new local conflitcs, and ultimately when I didn't have anything to do I checked for opposite conflicts and removed slides that weren't needed.