Comment 11 for bug 996816

FYI, there's a work-in-progress branch that addresses this issue in trunk, improving the module loading mechanics and introducing at the same time a "base.model" that can be inherited like a regular model if you want to alter the core API methods (allowing "meta" modules like audit_trail or base_action_rule to plug themselves in the ORM without having to monkey-patch or wrap the core CRUD methods)

Have a look here if you're interested: lp:~openerp-dev/openobject-server/trunk-base-model-thu