Include the ability to edit scanned color images from negatives with filters to enhance age related fading or to remove color casts such as the green tint caused by flourescent lighting or the orange color from negatives

You could create add-ons that you could sell as extra's. This would not only make you more money, but make the program much more versatile. I've purchased plug-ins for Photoshops, but they are expensive. Make the price competitive and i'm sure you'd win over many users. :)