In order to meet our guidelines of sensible defaults I was in a bit of a bind; the default values used when creating a feature are hard coded. Both in GeoTools SimpleFeatureBuilder.template( SimpleFeatureType, String ) and also in the CreateFeatureCommand.
Added a FeatureInterceptor to register against a "createFeature" activity; later we can add "addFeature" and "removeFeature" if you are interested in logging or security checks.
Documentation created here: - http://udig.refractions.net/confluence/display/DEV/10+Interceptors
summaryAdded Feature Interceptor extensions