Hello,
I have implemented production rendering in your Render window, and it works well, and since it includes both progress information in the status bar, and a Stop button, I do not need to pop up an extra progress window, as we had in IFR 1.x.
Would you consider adding a Pause/Resume button next to the Stop button? That would be wonderful for us, it would mean that we need no custom code, everything would be handled by your interface.