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    $\begingroup$ Yes. Use System`Private`SetNoEntry on any expression which you want to protect in this manner. $\endgroup$ Commented Oct 8, 2014 at 13:42
  • $\begingroup$ @LeonidShifrin Is there a simple way to undo atomic? I know only HoldPattern@uncover@_@args__ := {args} and uncover@atomicExpr. $\endgroup$ Commented Oct 8, 2014 at 13:58
  • $\begingroup$ @ybeltukov My impression is that, for a given expression, once done, this operation can't be undone. So, one would need to do some version of the "semi-deep copy", as you did. I may be wrong about this though. $\endgroup$ Commented Oct 8, 2014 at 14:07