The reason I want to do this, is because google and yahoo both give higher placements to sites, where the search-term is included in the URL
If I search for the word "miniBB" on Google, the sites where the word miniBB are part of the URL, will rank higher, that sites where miniBB is not part of the URL
This means that a page with information on miniBB that has the address http://something.com/something.html
will rank lower than a page with the address http://something.com/miniBB_page.html
Doing a mod_rewrite that gives you file names that include a lot of words is a sure way of getting extra hits - that is why it is so important.