Have you read the manual, afterall?
This guide refers to almost all miniBB features and possibilities. It is created both for user and administrator, and is included in miniBB package as "default" FAQ. You can use this manual as basic user FAQ for your page under GNU Free Documentation License described below. If you are using this guide as FAQ in your forums, remove all administration and developers guide, described in "Installation", "Customization", "Administrative options" and "Some notes for developers" sections. Regular users should read about this possibilities.
So, the main idea is that you need to CHANGE this manual for your forums manual, and your forums manual should be accessible for ALL users. Good benefit of current manual is that you cut off necessary parts from only ONE file.
Thank for suggestion - but we have no plans to change something here.