Reflection,shadow, texture and lighting are all important in a renderer and being able to adjust those quite easily would be great. Some renderers have their own components which will emit light and reflectivity and the renderer will notice these preset characteristics, but it would be nice to select a material or object you have in your model and adjust the basic characteristics of it as the render works. Another thing I like about other renderers is it will regenereate your rendering as your work and move around in your model. You dont have to hit ‘render’ and wait over night to see what it is going to look like and then make adjustments and wait another night guessing and checking. It would be great to be able to turn this ‘live’ rendering function on and off so that your computer doesnt bog down if you want to make major changes.