Yes, definitely. I don't agree with messing with people's keyboards, etc. It confuses the user and opens a whole can of worms.
I can agree with read-only access (just find out the status) which you can do using the link to the script I gave earlier (though it's not direct, it uses a method to determine that). It can prove useful when entering passwords - you can inform the user that they may have left the caps lock key on by accident.
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