This is based on a customer issue raised in the site forums. For full details, please see http://nuget.codeplex.com/discussions/429420
It's naively easy to accidentally check in a nuget.config file that's specific to a developer environment. When this happens, a range of unexpected behavior can ensue in build or test environments. This request is to add a flag for ignoring the nuget.config hierarchy and using settings only from the one in %appdata%\NuGet\nuget.config.