I would love to be able to tell my server to cache specific music on my Samsung Note 3. I'm not sure if this is even an option with the current API but I prefer to save data and cache what I know I will be listening to for the next day or even week on my 64 gigabyte micro-SD card.
I understand I can manage it from my phone and the interface in DSUB for this feature is really easy to use but I want central management. My son is on a different carrier with really spotty data service where he lives so it would be nice for him to be able to sit down at my computer and manage his cache as well when he's over. I have a very large collection which is much easier to browse from the PC interface.