> I want all Children Folder contents to be visible from a Parent Folder. Actions would still be done to the Child folder the email actually exists inside of - the Parent folder is for presentation purposes only. This is basically how a Search Folder works currently.

I seem to remember Thunderbird having saved searches that worked as folders, and they should work in this manner. Does Outlook have a way to save a search like that? It's not ideal, as you have to set it up and it isn't necessarily in the same spot as what it's searching to make it obvious what it is, but it might be better than nothing. If you can't set subfolder display order, creating a saved search of all the relevant subfolders as "0 - Combined View" as a subfolder itself that sorts to the top might get you most the way there.