I have a few suggestions for features I'd like to see in future Indigo releases.
1. Normal map support, as this is visually superior to bump maps.
2. Adjustable sun angle (shadow sharpness), as this would be very useful for cloudy outside renders.
3. "Shadow only" feature, that allow you to place an object directly in a HDRI or backplate with shadows under it. Maybe this is hard to do, as Indigo is physically correct, but it would have been an awesome feature to make it compete with renderers such as Vray, Mental ray and Maxwell.
Please take this into consideration. Thanks,
OJ