How about making Mint's meta-packages about it's WM/DE offer? This way if you install main edition but later want to switch to KDE or Fluxbox for instance it would be super easy to install those desktops and have the exactly same experience as if they were installed from scratch.
One of the *best* things of Linux Mint -and the ones that keep me coming here- are the way-too-good polished interfaces (this is what elegance really means, congratz on that), usability out-of-the-box, best GNOME3/Shell user experience, openness and overall stability - although with a certain lack of speed, an Ubuntu heritage no doubt about it.
Finishing, It would be cool to be able to install Linux Mint Fluxbox at any time with a simple apt-get like:
# apt-get install mint-meta-fluxbox
And have a full Linux Mint Fluxbox edition at my fingerprints :)