TTM, actually Bulgaria is on the forum, which I think is strange given that Romania is not. I would also like to see Serbia and Albania on there.
Just double-checked and Bulgaria is there. In fact, I found the post that mentioned it being a new forum. So it looks like it can be done relatively quickly. https://community.ricksteves.com/travel-forum/bulgaria/new-forum
ETA: I found the original post asking for a new Bulgaria forum, but the reason was that Bulgaria was added to Rick's tours. So I checked and it looks like the individual forum countries are the same ones visited on RS tours. Right now there is no Albania, Romania and Serbia tour on there, so I have a feeling that it won't happen.