My Suggestion: add boolean support like AND OR NOT (or other aliases for them) etc to increase utility of forum searches
Why: There are so many times when I'm looking for something but it's incredibly difficult the find threads that are even remotely promising because so many people most threads like ISO such and such. I think boolean support would be generally useful in this case or others, especially if there is an option to search only the topic titles. I would love, for example, to be able to search for something like "bugged 4os ~ISO" or "bugged 4os NOT ISO" to find some useful threads instead of finding that 90% of the results for my search are ISO threads. There are, of course, many other situations where booleans would be incredibly useful for searches but this happens to be the one that's been driving me crazy lately.