It's already in Opus: Content Type formats.
They're turned on by default for images, movies, music and (possible) documents. They're discussed in the Folder Formats FAQ, the introductory tutorial and the manual.
It's worth reading at least some of those things, and the other tutorials linked from the forum, before assuming that things can't be done. You'll find out about all kinds of stuff that you may not have stumbled on otherwise, too.