full text searching would put a huge strain on the db itself, no matter if we did it with the current search engine, or with Sphinx search. The database is currently 7.9GB, with the BULK of that storage being chapter data. This is why it can't be implemented.
If this was all html pages, rather than scripted content, sure, we could use Google search to do exactly what you say. However, since the content is database driven, and to get the input requires form use to begin with (invisible, but still a form of a kind), Google search CAN'T index that. The crawler has to be able to LINK to specific pages (static pages) to crawl.
If what you're really wanting is for us to eliminate that page itself, sorry, no can do at this point.