The feature you describe is a good idea. However, this is not the place to request the feature, since the people who run the BBS can't do anything about it. You should request that feature from the people who wrote the BBS software. They can be found at http://www.wwwthreads.com/

One of the nice things about the WWWThreads license is that they encourage modifications to their code. This could easially be added without having to wait for a new version of the BBS to be implemented. It's just a matter of finding the right script and adding in code to echo the URL into the message.