Ive wanted FPs that both factions would participate in and would eventually meet either during the FP or at the end. If you kill them or work with them would make a different outcome to the FP.
Operations would consist of 4 pubs and 4 imps working together. At the end, again, you could decide on both working together and loot would be split amongst the 8 people. Or turning on one another and then the winning faction would get to roll on all loot.
This is what I would love to see, a cross faction FP or OP with either a betrayal or truce option to give a different ending.