Maybe I'm missing something obvious, but I don't see any way to search within a category for bugs or suggestions that contain a particular keyword. There is an option at the top of the page to search just by keywords, and options when viewing a category to filter by status, but I'm not seeing any way to search or filter for a keyword within a category. This seems like it might be very helpful in reducing the number of duplicates that are filed.
I'd expect to have some way to enter a tag into the search box (maybe this is supported in a syntax I didn't try?) or to have a "filter" option at the top of the page alongside Sort By and Filter By Status.
Or is the hope that these will get caught by the "similar" links that pop up after entering the title? If so, this feels like an awkward way to solve the problem.