I have posted a question about this, and since it is not yet implemented, I figured it would be nice to propose it as an enhancement. It would be nice to have inheritance between BOs, exactly as any other object. Meaning, for each BO to able to inherit properties and methods of a parent BO, and also add some of its own (both properties and methods).
Anything that makes the framework more object-oriented, whould lead to more managable code.