Dear Alessandro,
You know, when I post any question here, I first think of you to receive a response from 
Luckily, I got today also. Thanks for your repsonse.
Now coming back to the stage settings, I would like to tell you that this check box is not selected at any stages as of now. Even though approvers are able to approve it! I dont remember the 1072 settings as of now (I am not even in front of the system).
As you know, 1072 says "Mitigation of critical risk required before approving the request", does it mean that for ONLY CRITICAL risks approver has to mitigate and then approve the request? How about other risks types? Please clarify.
Secondly for "Obsolete" mitigated users, I see that it can be "deleted" by running the risk analysis report as you have suggested. However, this is a kind of work around, I perceived. This requires an extra amount of attention and work. Is there any way we can control this by using any configuration or otherwise to make it automatic?
Please advise.
Regards,
Faisal