2
you can set that via the administratin of newbb 2.0
there you have that options, bbcodes are always XOOPS wide - not module wide - so you would need a kernel hack for that
but that would be senseless, you are now in a content management system not in a forum software - so all option for for exampel the newbb modul are in the administration of newbb 2
when you need "new" features for that module, try to contact the developer maybe he is working on such a feature or try to hack it yours self if you know what to do or you find somebody who can to do that for you
but i think you have that option in the administration take a look