Single Product Affiliate Setup

Who do I need to talk to about commissioning an update to Affiliates+? I am sort of in a bind and rather than pulling all of my WPMU plug-ins and starting from scratch with another scheduling plugin, another eCommerce plugin, and another affliate plugin, I am looking into possibly hiring somebody to just add a feature that would only allow affiliates to receive commission on items within a certain category or tag.

I am not a programmer (obviously), but it seems like a simple enough addition.

It is literally the only feature I am missing on the website, but it needs to happen.

Thanks!