Objective: Allow users to "combine" all the categories they want to see into ONE cate
 

Ok. I have about 7 categories, with 5 sub-categories for each.
Objective: Allow users to "combine" all the categories they want to see into ONE category!

I would like to have a single forum that "dumps" or "shows" all the threads of those categories and posts.

So before:
MAIN CATEGORY1
-sub1
-sub2
-sub3
-sub4
-sub5

to:
MAIN CATEGORY2 with MAIN CATEGORY1 and all of it's subs.

This is like running a "Search", but I would like for it to run natively, you know? This will allow users to "combine" all the categories they want to see into ONE category!

Is there anything like it? Or can anyone make one?

No real hack that allows changes to made to the forums on the user-end. Although you can perform searches in specific forums and have the result appear:

For example:
/search.php?do=process&forumchoice[]=28&forumchoice[]=17&childforums=1&query=searchword

&forumchoice[]=17 = Your Forum ID
&forumchoice[]=28 = Another Forum ID
&childforums=1 = Search in all the Subforums aswell
&query=searchword = What you are looking for, in this case its 'searchword'

More Info:
http://www.vbulletin.com/forum/showthread.php?t=107955

Thanks, that'll do for now. :)