I don’t think there is an easy workaround for this one. You could consider creating shares with random numbers instead of meaningful share names. The problem is that the NAS uses a built in media scanning, thumbnailing, indexing, downsizing to make the WDPhoto app run easily.
You could disable these services altogether, then WDPhoto would not work anylonger, but WDmycloud could. I didn’t try. You might want to ask in this post:
http://community.wd.com/t5/WD-My-Cloud/Sleeping-problem-is-worse-then-we-thought/m-p/687165
