Open.
When I post myself, I post open or caucus (on internal Catholic matters). The ecumenical threads on my list are posted by others.
I ask everyone to maintain a calm academic tone, stick to the topic, and generally behave as adults. I do not, however, expect anyone to sort out the “ecumenic” distinctions.
That is not entirely accurate; I posted a couple of ecumenical threads on consecrated life, trying to avoid injury to personalities. My inclination is to stick to open, though.
Thanks, just like to respect the wishes of the thread starters on the Religion forum. I know how touchy some of these threads can be. (not saying I am going to be rude, but if you wanted this Catholic only, I would respect that..)