Looks like it’s not something can be done without digging into the code. However i found a plugin the fits my needs pretty well: http://wordpress.org/extend/plugins/taxonomic-seo-permalinks/ with this you can just set /%your-taxonomy%/%postname%/ in the permalinks settings page and your done!
IIRF + IIS 6 + WordPress does not return 404 error
ngnix Url rewrite doesn’t work
So I’ve solved this problem, but I’m still scratching my head about the “solution”: add_rewrite_rule(‘api/autho/?$’,’index.php?__api=1′,’top’); This version of the rewrite rule works for some reason. I’m guessing that there’s some sort of namespace conflict that I accidentally stumbled across. Maybe /auth/ is used somewhere else?
URL rewrite of independent plugin?
htaccess rewrite, adding segment to url
Custom taxonomy and post type with same slug
Permalinks only for posts
Disable date based archives for all categories except one
WordPress rewrite rule not working