I've been thinking about taking pairs of Sound Sets and merging them under a single listing and downloadable zip file, similar to what many "visual" themers have done. For example, I'd combine my Tritone and Tritone Symphonic sets into a single Tritone Xtra; or Rezso and Rezso Symphonic under the listing Rezso.
Again, while many Dock Icons, Message Styles, Contact Lists, et al., include multiple variations in a single zip file, I've not really seen any Sound Set authors do the same. I suspect it's because much of the time, they're using larger AIFFs instead of MP3s or AACs.
I ask this as a question of utility, based on your expectations of a Sound Set download (i.e., file size, how many sounds come with a set, any other factors): Is this worth doing, or should I just keep the individual Sound Sets under their individual listings?