We've been doing CRM with F/D & CC combined for many years now, it is usually part of the emergency re-current which is also combined and even includes dispatchers.
It is always difficult to find group exersizes that involve both sides of the F/D door to an equal extent, certainly most accidents that are on video mostly highlight mistakes in the cockpit.
I've actually been thinking about creating a Scenario to be worked like a play, sort of like a loft program, all worked by one full crew plus dispatch. It would have to be well thought out and include variables depending on the decisions that are made as the scenario progresses. One crew would act-out/ work the problem situation while the other crews in the same class would watch and make notes fos subsequent review.
I'm not sure that I'll have enough time to actually put something like this together, but I would like to, because the scenarios that I have come across so far, always seem a bit one sided.