I was trying to keep the number of "front page" categories within a manageable number. I would be open to suggestions on combining some categories to a larger main category so the main page doesn't get too long. Once you enter one of the main forum categories you would then see the "sub-categories". Much like the forum you mentioned.

I am open to organizational suggestions. It's your forum. I'm just here to make it as perfect as possible! I take that Jeff Bezos build the best site and put the customer before everything attitude.