Improve Search Experience
It takes too much digging and effort to limit a search on this site. Make search more user friendly. For example, instead of forcing users to click a favicon in the search box, then selecting a different search engine, then selecting Advanced Search, then going to the Search in Forum(s) box, then figuring out what forum they were just on and going back to that Advanced Search page and looking through the options to find the forum they were just on and selecting, then executing the search. Holy cow! What a usability mess!
This would be a much better experience: add a search scope box next to the search box with a few - to -several search scope options. Possible options in the search scope box could look like this: Current Thread, Current Forum, Entire Site. Add a link near the search box for Advanced Search and display that link no matter what search engine is selected.
And consider only implementing one search engine for your own sake.