my s2r800 has been down on the clutch side twice, as long as its holding oil the thing is pretty much indestructible, I wouldnt worry about it unless you are having an issue with your clutch or looking to powder coat it.
the other side of that case has a steel plate and a rubber "silencer". it would take a pretty severe knock to really affect anything.
Thank you. That's good to know about the inside of that case.