Good idea, I like this in addition to tagging mentioned in another comment. I've added a ticket for "any" filters. Thanks! Edit: I just remembered that you can

Good idea, I like this in addition to tagging mentioned in another comment. I've added a ticket for "any" filters. Thanks! Edit: I just remembered that you can also manually edit the search results query string to remove parameters you don't want. For example, /gear?brand=canon shows all Canon gear, in any location.