Yes... exactly. I have some apps like you've described Outlook, where a new window is spawned for various reasons, and I don't want it specifically to auto group. If I could use the Custom Rules to ID that by class or title or something, then I could prevent it from auto grouping.
Sometimes these spawned windows don't have the normal min, max, close buttons or even aren't resizable. Preventing them from auto grouping, while at the same time, directing the main window of the app to auto group would be very nice.
Thanks for listening and I hope it finds it way into a future update.