Hi Alper,
Thanks for the great links from SAP Library. I want to find a specific document on what are the standards in transporting roles based on the changes you have made to it. As I have said, please see example below:
1. Addition of transaction codes to roles - I include all the derivatives including the parent role in the transport request.
2. Addition of Organizational Values to Organizational Units - I still include all the derivatives and the parent role in the transport request.
Is this the correct approach or not, are there deeper technical reasoning with the examples above?
Hope you can clarify further. 
Regards,
Santi