A Classifieds forum maybe???

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Basically, I think we are allowed to use multi filter in XThreads. But I'm not quite sure if it is secure to put {$tf_filters['key']} or {$mybb->input['filtertf_key']} directly in template. And, it's hard to "manage" the input fields in newthread template (for me). If the classifieds forum really need that kinds of category, I think it is easier to use forum as category, and XThreads filtering system as "sub-category".