Use forumdisplay as forum home

[downloadsuk]

So,

My board at the moment has one single forum and I want to have the forum posts as the home page.

I know I could make my own custom page, but seeing as FORUMDISPLAY is already set up to do this, it seems like a needless task. However - FORUMDISPLAY will only display the forum it's passed a request like "?f=4"

I can set the forumhome page to be FORUMDISPLAY, however, vbulletin appends .php after the name, so I can't put "FORUMDISPLAY.PHP?f=4" as the home page because the url ends up being "/forumdisplay.php?f=4.php"

I've been looking and looking at all the vbulletin files to see if I can find the place where the values get parsed to tell FORUMDISPLAY exactly which forum display. i

is it in init.php? forumdisplay.php itself? and how can I modify the values to make it display a forum by default if it isn't supplied in the URL?

Any help is greatly apprecaited.