hi !
my english is not better 
you can find here some information about your request : http://www.punres.org/viewtopic.php?id=254
i don´t find any MOD that could make what you want, but some guys have allready try it, with succes i think !
there also something, called "PumBB Supermod" http://www.punres.org/desc.php?pid=82
it´s a package that contain PunBB 1.2.5 and other mods, allready installed (PunPortal, PunPMS, Colored User Groups(in navbar too!), Easy BBcode, Easy Smiles, Extra Boxes, last topic instead of time, PunPoll, change link, many plugins, ...)
have fun ! 