Starting Points are a potentially very useful feature in Concrete5 similar to the concept of Install Profiles in Drupal. We found in our attempts to create StartingPoints using the existing tools that the XML required a lot of manual trimming that was not only time consuming but almost impossible to get organized. We thought there must be a better way, and there is. We have built this Starting Point Generator which not only limits the XML exported to what is needed for the custom C5 install, but it also creates a working Starting Point Package.
Download on GitHub at https://github.com/goldhatdev/starting_point_generator