Preventive Maintenance for non-"Product" level coverage

Hello,

We are using PM Scheduler functionality (11.5.10.2).
It is working as expected for contracts with covered product level coverage.
However, I noticed that when we have covered item PM Scheduler is creating PMs for all applicable IB items.

Questions:
1. Is there anything that can be done to turn off the creation only for covered items? Or have only SR created instead of one SR per instance?
2. The functionality does not work when we have covered site or covered system level coverage? Is there anything that can be configured to make this work? Is it possible to have only one SR generated for the site/system instead of having one SR per instance at the site/system?