Other ideas that were incomplete or worth considering are found at Summer coding ideas for 2009.
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Turn smock into a real program
Summary of idea: smock is a hack that Dan and I wrote a few years ago that lets you build a chain of RPMs in mock. It works out all the dependencies and builds the packages in the right order, using the result from an earlier build to satisfy dependencies in a later build, and being almost completely automated. What really needs to happen is that mock is extended to support this as a native feature.
Summary of idea: