What is a best practice for doing iterative development with 
MCConfigurations?

I want to be able to make plenty of short, incremental improvements, 
with a map defining the stable combination of packages each time.

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In principle, you just have a MC package with one class having a 
number of configuration methods. This package is updated, and the 
latest config in it is then loaded. You can see a public version of 
that in Sophie:

    http://source.sophieproject.org/Sophie.html

Look at class SophieReleaseBuilderDeveloper (in package 
Sophie-Releases). On the class side you can see all the configuration 
methods. This is a subclass of

    ConfigMapReleaseBuilder (in package Deployment-Configs)

which contains the configuration-to-method conversion routines.

- Bert -