Are there any benefits to a forum/Q&A website to find out feedback and features of a website?

I am in the process of designing and developing a website for my local community. I am using tools such as surveys and interviews, but wondered if there is a technique that would involve users posting in a forum or Q&A website?

For example, I was thinking of setting up a forum for users to post ideas, respond to ideas posted, post requests etc and letting users respond.

Something like "What features would you like to see on the ABC website?" and then let them reply in a forum post style.

Does anyone think this technique is good or not?

Any advice would be great, thanks!