Is there any way the screen saver can recognize nested folders?

Since the last couple of updates to Mac OS, the screen saver function has regressed in features. I have not been able to get the program to recognize pictures in nested folders--something the program did without problem in earlier versions of the OS. This severely limits the slide show capability of the screen saver. Why would an OS update--an improvement, if you will--reduce significantly the functionality of a built-in feature?