Search for just tropes?

For those of us who can recognize a trope, but may have no idea what it might be called here, or whether or not it even exists, and haven't memorized every trope in the system, it would be really handy if there was a search box that searched only tropes (and only tropes that had content).

That's what Lost And Found is for.

You can also put inurl:pmwiki.php/Main/ into the search bar to get only pages in Main/, which should theoretically be just tropes and indexes.