I will create the forum, but I must submit my reason in denying it in the first place was because I fear there is simply not enough interest in it for a totally dedicated forum. Times in past on previous boards I have created sub-forums and usually they are used at first then die out and given the history of simpit threads here not staying active I figured it would be the same for the sub-forum.
Please understand it's not that I give addons infinitely more respect, it's simply that addons are the biggest addition to Orbiter which
all can enjoy. Although simpit building threads are educational and interesting, especially for those who're looking to build one, most people will never have the time to do something like that. That said, I am creating the sub-forum now, let's see it gets used.
Best of luck!