Once your software gets big (and it will) your forum will reach the point it becomes unmanageable . . . people will start to show off their models, have modeling-technique questions, post tutorials, etc. You may be able to answer everyone’s questions right now, but in a month your forum traffic could easily quadruple or more.

What I would want out of a forum dedicated to modeling software is an organized support and discussion are where members keep it afloat. Start with like 3-5 categories, like Gallery, MOI Development, Modeling Techniques, and The Lounge. After a couple months you can split up those sectiosn of they become bloated.

Most people are used to PHPBB style forums, and some of the subtle features can actually become quite useful over time.

P.S. Use firefox to browse forums, the "Open in new tab" feature makes browsing so much easier.