You can currently search all mods, mods by version, all articles, all styles and all graphics in the drop down, so how about a search for only normal forum threads outside of all the above forums? I've wanted to search general discussion topics a few times before, but the all forums quick option shows every possible form of content...
You can go into the forum and use the Search this Forum drop-down to search that forum. (Although, I agree that it would be nice to have that in the top drop-down also.)
I would use it if you had Community Central in the list. I sometimes search for issues I know we have covered before in the 'help' forums and it would be useful to have Community Central be searchable in the drop-down on top (instead of having to go to Advanced Search to search titles in those forums).