I would LOVE LOVE LOVE to be able to just search the ideas forum. I'd like to post an idea, but would prefer to give support to an existing thread if it exists.
Great idea; it would be a neat timesaver! :-) In the meantime you can use a site-specific search in Google, by typing this in the Google search window:
"butler" site:glitch.com/forum/ideas/
This will return results only from the Ideas subforum. Just replace the word butler with your own keyword(s). :-)