I've read that Trevor both would and would not support user created subdirectories for decks.
The last post I saw (but might have missed some) indicated they would be supported. If so, any timetable on when?
I started doing it, but a number of things I wasn't expecting started popping up. I don't want to release it with it not working well because a ton of people will get frustrated.
For an example of an unexpected added difficulty, with with folders, people would expect to be able to see a folder and a file adjacent to each other in the file browser and click and drag the file into the folder. And people would expect a way to click a drag a file from a folder to its parent directory.
I will wait until I have figured out all of the issues and I'm not sure how long that will take. I have a number of other things that I think are more important to fix/add first. In the interim, I suggest a deck naming scheme that helps.