package overrides are can be used to override control files in a wigwam package. This is most usefull for overriding the .options file, to build with different options than the original package, without having to make a whole new package.
Simply create the directory $PLAYPEN_ROOT/package-overrides and drop replacement files in there. Note, this currently only works for files of the form PACKAGE_NAME-PACKAGE_VERSION.EXT where EXT is the common package extensions.
[TODO: this needs a better explaination]