Idle speed can not easily be adjusted.
To check the eccentric cam gears you only need to remove the valvetronic motors. I would check both sides since you only removed one valve cover before. You can't say the engine is healthy if you only checked one bank.
Saying the engine has been slightly "rebuilt" is actually cause for concern for me, to be honest. Most people don't know how to rebuilt the N62 correctly. I would
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