a way to do it could be adding shares to “Pictures”, “Video” and “Music” libraries, and then adding the shortcut of libraries to the taskbar.
here is how to add shared folders to the libraries (unfortunately only the three “multimedia” libraries can be used, and not the “Documents” library or any other added library): http://community.wdc.com/t5/My-Book-Live/adding-MBL-shares-or-folders-to-Windows-8-Libraries/m-p/526649/highlight/true#M17424
