gonna order the perimeter seal and try to replace it (think its part # 54107199533 for the entire perimeter of the pano moon roof opening). Will let you know if it solves the problem of "rattling roof over bumps, but goes away once I press up on glass with my hand".

but the more I read, the more it seems to be a loose screw/cassette issue, where I have to drop the head liner

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S