Part of the idea behind mongrel2 and using sqlite is that there isn't supposed to be a canon config script/format thingy. Baking m2sh into mongrel2 so you can pass it in with a flag canonizes it.

I admit that right now it does seem to be the de facto standard but that's at least partly because the m2 community is small enough that Zed is still important in it so the tools he ships are the tools people use. In the event that m2 takes over the world though an -m2sh (or similar) option is going to be criticized as obsolete bloat that no one needs because every one uses the M2ConfigDeploy.py library.