Pro Sites Premium Theme Management

I have acquired a pretty good selection of themes that I would like to offer to my premium members, however in the premium themes section of the Pro Sites plugin there is no way to filter the themes. Once you have more than 10 pages or so of premium themes its makes all of the selections unmanageable. "Nobody wants to browse through an unending list of themes to find the right one". I was hoping that somebody could please offer some advice or solutions to make the premium themes and plugins filterable so that customers can quickly and easily search for a theme or plugin that matches their requirements. Thanks alot