"My hesitation in posting any of those is not to incite any lurkers looking for the 'linchpin' that will bring our two Churches to fisticuffs."
Well, if any lurkers think the filioque is still a causus belli between Orthodoxy and Rome, they will find that it is pretty much a dead issue since the Agreed Statement back around 2000, NYer. I wouldn't worry about controversial issues. If there ever will be a reunion, we'll simply have to deal with them. To that end, discussions here will be helpful. It may be that we will simply decide that some issues should be left to the decisions of the particular churches; in others perhaps not. In any event, my reason for mentioning the filioque was to demonstrate how problems addressing local issues troubling the Church (from the outside) which eventually effected the entire Church arose in what was a then unified church. In any reunified church of the future, even more powerful intrusions than Arianism in Spain will present challenges which will have to be handled more carefully, or perhaps I should say more attentively, than the filioque was.
"However, in all frankness, not posting ECF commentaries on these issues also does an injustice. How would you prefer to handle these topics - Catholic Caucus or Catholic/Orthodox Caucus?"
I see absolutely no problem with the way you posted the snips from the Fathers. Most of them, so far as I know, are understood in a common fashion by both Rome and Orthodoxy. At least one is recognizable as a patristic statement used to support the Roman Catholic view of the proper role of the Petrine Ministry. Orthodox people think that Roman Catholic apologists read too much into it. Now that is a subject which has the potential to get contentious, but it is also the very subject of the present dialog among our hierarchs so it seems likely that they at least have decided that the topic is worth their time. Likely its also worth ours, contentious or not. In all honesty, NYer, I doubt if any of us, lurkers or otherwise, think anything we post on these caucus threads will cause a lightbulb to go off in the heads of the heterodox and present them with new charges to level against The Church. They seem to do quite well with traditional objections as we have seen. In any event, when we get to some of the finer points of doctrine and where the Fathers stood on those points, we all know the issues so its unlikely any outsider will come up with something we haven't already seen.
Don't worry about not posting Orthodox commentaries on these subjects. We will if we think they add something as we will similarly add primary source materials as necessary.
Devotional topics, at least a limited number of them, perhaps should not be joint. For example, as you know, Orthodoxy does not hold by the dogma of the Immaculate Conception. While that dogma per se might be a wonderful topic for a joint caucus, a devotional thread on it likely wouldn't be. See what I mean? Fatima is another such topic if the purpose of the thread is to discuss the subject in a devotional way. I am trying to think of an Orthodox topic which might fall into the same category, but right off the top of my head, I can't think of any.
A, K, what do you think?
Ditto in the Eastern Catholic Churches.
Now that is a subject which has the potential to get contentious, but it is also the very subject of the present dialog among our hierarchs so it seems likely that they at least have decided that the topic is worth their time. Likely its also worth ours, contentious or not.
I like your train of thought :-)