[racket] Alt/Option key as meta on Mac

Hey Racket Users,

Just trying Racket for the first time, and very excited to finally be
learning it! I've been wanting to for years.

Just had my first encounter with DrRacket, and am trying to get comfortable
with keyboard input. According to
http://docs.racket-lang.org/drracket/Keyboard_Shortcuts.html,

On Windows and Mac OS X, Meta is only available through the Escape key.
>

Sorry to see it's not possible to bind the Alt/Option key to Meta, as it is
with e.g. Terminal.app, as it would be a huge usability win; the Escape key
on most keyboards is one of the hardest to reach, aggravating RSI the world
over. In http://lists.racket-lang.org/users/archive/2010-August/041085.html,
a post from 2010, Matthew Flatt alludes to adding support for Option as
Meta after a soon-coming GUI rewrite, but I found no further mention of it
here, on GitHub (https://github.com/plt/racket/search?q=meta&type=issues),
or elsewhere.

Just thought I'd inquire again about the possibility. On the off chance
it's a matter of submitting a newcomer-friendly patch, I'd be delighted to
give it a shot.

Thanks for reading, and thanks for the great work on Racket.
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