They were probably just left out at first. Also, what is the point of creating forums that are not posted in? If there is sincere intrest, it would be gladly added.
If there is intrest in a new forum, post it here
New Catigorys and Forums for our Message Board
Before I was a mod, I wanted a Caprice forum in Chevrolet. I made a thread in there requesting it, got a couple others to show support, and a couple days later....poof there it was.