I'm not sure what you mean by this.
The Forum looks good just the way it is in my opinion. You have the Professional Plumbers Forum which is similar to a couple Forums I have on my Site. This allows the tradesmen/women to shoot the breeze without the meddling of the general public. This helps keep the tradesmen friendly with one another and keeps them coming around. I also have one called Privileged
Characters which allows Moderators to grant permissions by recommendation of other members. It gives people a feeling of superiority even if they aren't in the trades. I think it works better than the ranking system.
You have done a good job with your Forum and don't really know much that could be added that you haven't already thought of.
bob...