Windows 7: Enable alt-v/X for all subdirectories containing pictures at once?

Let's say I have one directory and lots of subdirectories within it which contain all pictures.. I have my explorer setup to only display only filename.ext_filesize. But for this one directory I'd like to temporarily enable extra large thumbnails ("alt-v/X) for all of it's sub-directories. is there a way to do this bc always hitting alt-v-X within each sub-dir is a pain.. especially when you have lots of directories like this one. or maybe temporarily want another folder view each time for such directories.

I tried right-clicking the parent dir: properties/customize/customize directory for: pictures - for all subdirs.



But this does not display all pictures in subdirs as thumbnails.