Cross-thread "reserved key codes" is problematic

[annevk]

You need to queue a task to update this. Currently the way you've written things the "in parallel" thread could update it, then hang for seconds, then add another key, etc. That wouldn't give very deterministic behavior.

[garykac]

Thanks!

[annevk]

I'm not sure that's the right fix. You presumably still want to go in parallel first, to obtain permission and such or allow this to be rejected for some out-of-process reason?