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It's my understanding that the Java search tab supports some really cool search strings, like specifying a method signature with wildcards. I could have sworn I've seen this demo'ed, but I've never been able to figure out what the search strings are supposed to look like. Assuming I'm not totally off my rocker, it would be nice if there was information available from the dialog about the searches you can do beyond just entering a type name.
Something that would fit into the current story is to provide code assist in the pattern field.
For 3.1, I'd be thrilled to just have a few examples added to the help. :)
I'm not sure that there are so many tricks that aren't obvious. But you're right, we could improve the help a bit.