The problem with this is that it wouldn't really be sufficient to just search root posts - and most forums don't offer this. The issue, instead, is that you need the ability to search a thread, rather than individual posts. This, however, is currently nor possible due to a limitation of our search driver. It's something I definitely want to address in version 2, with a new search driver, but it isn't something that I can deliver in this release.

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Jason Rhinelander
Gossamer Threads
jason@gossamer-threads.com