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I've bound both caps lock and the ctrl key to "ctrl" in OSX, but I would like to be able to press a modifier key along with caps lock to turn on caps lock—say, for example, shift+caps lock. How might I be able to accomplish this?

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You could use a private.xml like this with KeyRemap4MacBook:

<?xml version="1.0"?>
    <autogen>__KeyToKey__ KeyCode::CONTROL_L, ModifierFlag::SHIFT_L, KeyCode::CAPSLOCK</autogen>

SHIFT_L can also be replaced with FN.

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