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I can't see how OP_CODESEPARATOR can be used, either. I'm tempted to suggest that any transactions using it be 'discouraged' (have miners refuse to build on blocks that contain transactions using it).
Transaction hashes might be another, separate discussion topic-- I've been thinking that the way transaction hashes are calculated/used could be improved, although I don't think it is a critical design flaw but in the category of "stuff we can live with but that maybe could have been done better".