with and scope chain augmentation

Watching the "Changes to JavaScript, Part 1: EcmaScript 5"
http://www.youtube.com/watch?v=Kq4FpMe6cRs
I came to think of augmented scope chains for DOM0 event
handlers.

I sympathize with the slide "Problem: Can't emulate
platform objects" (which is addressed by e g getter/setter
properties), but the removal of with(){} in ES5 strict mode
would mean it gets harder to emulate the scope chain
augmentation done by browsers?

Best regards
Mike Wilson

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