Retina MacBook Pro...is it safe to keep the screen closed?

1. Can heat affect the screen or the computer if the lid is closed while using an external monitor?  Should the screen be left open just a crack or is it
ok to be closed completely?
2. Is the screen safe with the lid closed from the keys on the keyboard?  Is there any chance of keys hitting the screen and scuffing it up when the lid is closed or should I keep a thin cloth or something in there when the lid is closed and transporting it around like the kind it ships with?

Thanks! Thats pretty much what I thought as well for both questions!
I was worried about #2 and asked because I remember years ago a model MacBook that did have keys that could (and did) scratch up the screen when the lid was closed and have always kept something in there since (usually the divider that ships with it).  Good to know that doesn't happen any longer.

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