Shared Directories
 

LimeWire needs a function for adding a directory "and all subdirectories". I have my music semi-organized in dozens of subdirectories and it appears I am going to have to add each of them separately to make them shareable.

Shared Directories
 

But they are shared as sub-directories. To see them, click on the arrow next to the directory or folder in the Library window. That will open up the next level of the directory.

I share my iTunes library. This is organised into iTunes Music Library > Artists > Albums

BTW you can also unshare particular files in each folder or directory.