Users should be able to create new meta words that as a crawl is going on automatically get stored in the index.

So a crawl that includes a dictionary site might have the new meta word definition:$1 http://dict-site.com/?word=$1

Fixed with commit 1ce44ca. User defined meta words must begin with the prefix u: You can add a meta word under the crawl option. Adding the meta word: definition with url pattern http://dict-site.com/?word=(.+) would mean you could do a search on a word definition with the meta word

u:definition:word_to_look_up