Hi Bjørn, there's been some discussion of the matter and I've seen nor hine nor hair of it in any official spot; but is the following going to be a rule at some point?:
(Written sometime in March)
"Yes…but the rationale behind making Diplomacy a Realm action is that all actions that have Court as a modifier should be either Realm actions or Court actions (not counting Regent actions made into Realm actions)…which has implications for Trade Venture…add Court as a modifier or make a Regent action…
B"