Different affiliate percentages for users

Hello,
I know this question has been asked before, but I wanted to see if there was any updated information. I'm using the Affiliate and MarketPress plugins with a multisite setup. I have it setup so that the users have a subdomain site within the multisite and they are affiliates for purchases made on the main site through MarketPress. Is there a way to have some of the users receive a different percentage when goods are purchased from their customers through the main site using MarketPress? Or is it still just the global percentage for all affiliates? Any help would be greatly appreciated.
Thanks,
Matt