I haven't done so, I have only user end experience with this. However, I think that would be a good idea to do so, especially if the topic is a good one or receives several replies. A small update to the policies should clear the way to allow this.
I cannot recommend many modules, but I can say buyer beware. I would stay with DNN features like http://www.snowcovered.com/snowcovered2/Default.aspx?tabid=242&PackageID=18835\. Using others can crash your system, remove data tables or just plain out not work as described and you may end up spending more money to hire that company to trouble shoot their own product.