Hi Aram
Like I said, I dont know how it would be the behaivior of the passes, it always will deppend of the scene, sometimes 10 passes will be more than enough or it would require more, having an specific time or noise level I could know when its gonna stop so render history can be saved automatically, instead of waiting for i dont know how much time would take to finish the rest of the passes.
And for the interactive tab, well if many users are use to it, it doesnt mean that they would apreciate the change, I know alot of Corona users that doesnt even know where are some of the settings, especially because they dont use it, they doesnt even know that we can assign an automatic saving for the render history or that you can change the tooltips langauge or many other of the settings that are "hidden" in the system tab. For what I have seen many users are very happy of what u give them specially when you dont need to click on anything, in my case I like having everything in order.
Im more a Vray user but with the newest daily I wanted to give it a try and I loved what u have done for this version, I would like Corona to improve so we can have a better experience using it, because I ussually havent.