Many thanks for the effort Tom.
There are two aspects here -
# One is which episode is which and the relation to who published what when. The only concern I have here is that the databases seem to support only one of the outlets for distribution so if you are using video material from the other, it's going to end up wrong. That whole subject is still outside of what I can do anything about. I see the issue, but that is not the focus of the question.
# The other is how TVR handles single episodes split into two files. This is where my focus is.
From my Total Commander the two files that are the Part 1 and 2 of "Peril at End House" are these:
Plex accepts this as two segments from the same episode. So the name here adheres to Plex naming convention for episodes split into two files.
After a Quick scan in TVR, the Scan shows this:
As you can see, the destination name that TVR strives to rename to, is the same for both filesr(The original name is what you see above - I just cut this segment of the table) When I run it, one of them is deleted. It ignores the fact that they are two segments of the same episode and both should be retained. (I don't expect this corner case to justify such a big change but formally this is a new column; Season, Episode and then Segment, where these parts are two different segments of S02E01. And deleting one of the parts is not the correct behavior.
I didn't find any place where the Add/Modify rules requester would show up. Please describe where that is.