you have my vote, but shouldn't that be core?
It gets a bit more difficult because the search is no longer in core, so it has to hook into another search plugin. One thing at a time...
NodeBB already integrates a search-box in desktop resolution.
Kindly consider adding a search-bar to mobile resolutions. Something like the google search-bar in mobile phones (for some reason I can't upload an image).
Not sure however if this is a killer feature for everyone...