Schema: package property for model

There is a property "package" for the schema.yml file.
http://www.doctrine-project.org/documentation/manual/1_0/en/yaml-schema-files#features-examples:packages

But this should be used only for plugin symfony.

It will be good to have the same feature for classic model (not plugin), to be available to organize the model inside of the model folder.

This feature is critical for huge project. Indeed having 200 files at the root of the folder model/doctrine is very difficult to maintain.