Nereid said:
Assume, for the moment, that PF wishes to be primarily a forum for providing homework help in, discussion of careers in, and discussions of mainstream physics, astronomy, etc ... Suppose that PF would like to clearly demarcate mainstream from non-mainstream. PF would also like to be very clear in its guidelines as to its primary aims, what constitutes unacceptable posts, and under what circumstances we will ban someone. In all these guidelines, we also wish to be crystal clear that it is the owner, Admin and moderators of this site who will make decisions (and act on them) re moving posts, deleting them, warning posters, banning them, etc.
These statements have been made many times, particularly in threads over here in feedback and regarding theory development, and we do seem to have to continue repeating this information. It seems that a clear mission statement in conjunction with the forum rules would be helpful and could be added to the top of the forum rules post. I think your statement above makes a good dent in writing that as well. If we have a clear mission statement, then there is no confusion as to why non-mainstream posts are not permitted; they simply do not fit within the mission of this particular site. If there is a need/desire on the internet for a site that welcomes non-mainstream topics, then anyone is welcome to set up their own site somewhere for that and moderate it to the degree they prefer, but this is not the place for it.
So, working from what you've already written, here's my suggested wording:
Mission Statement
PhysicsForums is primarily a forum that provides 1) homework help, 2) discussion of careers and educational opportunities, and 3) subject-specific discussions of research and issues in science, math and engineering, with the main emphasis on physics.
Guidelines for Acceptable Discussion Topics and Forum Rules
In keeping with our educational mission, PhysicsForums aims to clearly demarcate mainstream from non-mainstream topics in physics and related fields. For the purposes of this site, "mainstream" is defined as topics covered in: 1) high school, undergraduate and graduate level physics, math, engineering, or other sciences textbooks, or 2) peer-reviewed publications, including journal articles and edited books. Non-mainstream topics, including personal theories, will not be permitted on PhysicsForums. The exception is in the "Skepticism and Debunking" forum, where non-mainstream topics may be presented by those seeking assistance in verifying or refuting claims made in non-peer-reviewed sources.
In all areas of PhysicsForums, any non-mainstream topics posted will be locked to further discussion and/or deleted at the discretion of the admins and mentors. All decisions regarding whether topics posted fall within the mission of this site and how threads containing those topics will be handled will be made at the discretion of the moderators (i.e., admins and mentors). A warning will be issued to a member if a non-mainstream topic is posted by them. Further clarification of the reasons for the warning, if necessary, can be obtained by contacting the moderator(s) via Private Message or E-mail. If a member continues to post non-mainstream topics after the initial warning, further action will be taken, including temporary banning from posting or permanent termination of membership.
Other Forum Rules and Code of Conduct
(The rest of the rules already posted regarding obscenities, flaming, spamming, etc. would go here.)
Did I miss anything, or is there anything else that needs to be changed to better reflect the site mission and rules?