Let's say for this particular shot I rotate the environment; change the FOV; orbit the camera around, adjust after post effects and do other rendering effects. Great! I saved the rendered environment as an image file and move on towards the next planned shot of course changing the rendering settings.

But then there's a minor tweak I have to adjust in the previous render shot and to go back to that previous shot I have to adjust my render settings to match or closely match it. That's a lot of work.

Which is why I think it would be a good idea to have a IRay Renderer Profile Save Feature that saves all your IRay settings so you can hop back and forth between shots that need tweaking.