My client would like additional sorting columns on certain category pages linked to product properties. The product property might be regular (weight, size), or a custom property made via one of the product property addons. Is there an addon that will easily let me select which columns are visible on each category page, or would that be someing I should be able to code in w/o too much difficulty? I have a basic idea how the programming logic would go, but don't want to reinvent the wheel.