I honestly cannot believe this doesn't exist. I understand that comments about the feasibility of adding features to software without any knowledge of the codebase are typically misguided, but come on, this is just an ordering a list based on random numbers. It's a very basic feature of every digital music player I've ever owned dating back over a decade. The fact that Sonos doesn't have it is a travesty and makes an otherwise A+++ system significantly less useful. I have to expend entirely too much thought/energy to work around this when I should just be able to add to queue, set album shuffle, and not worry about hearing everything in the same order or having songs nonsensically cut apart from each other.
Just add it.