In the post draw callback SceneView should certainly be checking for it a calling it, as what you are doing is a perfectly reasonable thing to do. I'll pop this on my TODO list for the day.
This feature is now implemented and checked into CVS. I've tested it against your callback and it works fine, the only item of note is that your callback need to _snapImageOnNextFrame changed to be a mutable bool to allow compilation.
Robert.
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