A little request

Just downloaded 2.2. Virtual folder filter is very cool. Can you make an option to apply the filter to all subfolders instead of having to set them all manually. e.g. I have a music/ music video folder and then a folder for each artist, with mp3's and music videos in the same folder for each artist. I want to be able to apply and mp3 filter to the whole folder including subfolders.

Thanks