[FleXy]

great idea and job, looking for something like this for 2 years! Need mod to simple upload and install. Maybe somebody can realise this at this way: create you own forumdisplayS.php file (modificated). and then we will create "Master Forum". Then install Plugin. Plugin will get option (ID of master forum from settings) and replace the url on Index.php to step users to forumdisplayS.php (modificated). all other options will be stored also at the db and edited from plugin setting menu.

sorry for my english, but the main idea to use 3th part forumdisplayfile.php and substitute there file only for master forum. Substituton need to do with MOD while parse_templated for forumid used by setting (or simple redirect another forum to url or forumdisplayfile.php?f=masterforum). Other setting will be managed by Plugin.