I've released a new version of Config::Model (0.643) that feature a new backend to read and write YAML files.
The other notable change is a rename of min and max parameters for hash and lists. These parameter are used to set constraint on the minimum and maximum number of indexes/keys in the list or hash elements. These parameters are now renamed min_index and max_index to avoid confusion with min and max value constraints for leaf elements.
This new version is available on CPAN and on Debian/unstable
All the best