I've never seen any program on any platform that allowed a user to assign any sort of macro function to a single character keystroke. It's always a combination of keys - alt+something, shift+ctrl+something. You can't assign the 'v' character to the 'u' key, for instance. The fact that it might work "for a little bit" is irrelevant. The relevant fact is that the OS "takes back" its property.
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