I want to append a question there: Is it possible that if you select "Random" as a country, the game still tries to pick from the original 10 countries, even if not all are playable anymore? (I had this feeling...)
Anyway, throw out countries by putting MultiplayPassive=true on them, and either set Multiplay=no on them or comment out the flag.
The name, obviously, via the UIName.
And without the patch, you cannot add working new countries. [
link]
One more thing: I'm posting these things because I'm posting anyway to append the question. Usually, all of this could have been found by a single look at [Nod] compared to [British], and a search for adding countries or something.
You need to fuckˇng RTFM, dude.