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Why do so many split keyboards not have "F" keys?
(programming.dev)
A community for news, discussion, and showing off your mechanical keyboards
I'm sure you have something that works for you already, but before I had a keyboard that just let me add the keys with firmware, I was getting by using AutoHotkey and a script that would turn double taps of an F-key into the F+12key.
I bought a little macro keyboard, but if I had the physical keys already, I'd be using them as macro keys!