The hard part isn't coming up with an embedded scripting language, it's not 
even coming up with a secure set of bindings that don't allow for unanticipated 
side-effects or privilege escalation, it's integrating the scripting engine 
into an event loop that wasn't designed to have a scripting engine in it.

And designing a secure set of bindings that do something useful without 
security holes is already pretty damn tough.

I would suggest starting with a restricted subset of Javascript in the web 
engine, for interactive notecards, and see what it takes just to get THAT part 
secure, reliable, and robust.
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