[tilt2k]

I had a look at the code and I scripted something amateur, so it could be not complete (i.e. it doesn't load sticky) or not secure but it works so far. Anyway if anyone want to build an interface/product over it be my guest.

This version is tested on vB 3.8.x
Use this plugin at your own risk.

How to use it:
Upload it into Plugins & Products > Import Plugin Definitions XML File
Go to Plugins & Products > Plugin Manager > Forumlink (Forums as Categories)

edit this part

$forumlinks = array(
//'50' => 52, 
//'52' => 50
);

using forumids you want to link, this way:

$forumlinks = array(
'20' => 22, 
'22' => 20
);

Save it and activate it.