You can sort of do this on the computer version of spotify by shuffling your 'library' but that is not an option to do on the iPhone application. Is this something that is possible currently that I'm not finding? Is this something that is not available currently to iPhone app users? If the previous is true, is this something that can be added in the future?

Example... I have my playlists set up by music type. Sometimes I prefer to hear all types of music shuffled together. I can't see how to make this happen currently.

Thanks
Zach.