atlrus - 4:16 pm on Feb 19, 2012 (gmt 0)
Did not realize this thread made the front page.
A couple of days after my first post I decided to remove the sitemap from GWT. But I did not remove the sitemap itself from the server.
So far I have not seen anything negative and Google is indexing my site and forums (in a sub-folder rather than subdomain) in a satisfactory matter.
Maybe I'm wrong but from your introduction I understood that you don't want to continue with the sitemaps mechanic because by adding a forum it may become a total mess.
You were correct, there is no way I could keep up with a sitemap including a forum :)