I use the palm keys like thumb keys; I curl my thumb down to press them. My hand may too big, or maybe I just don’t “get it.”
Th Keyboardio has always reminded me of a musical instrument, particularly a guitar. I’ve been thinking that I might be able to attach levers that would extend away from the thumb keys, past where the palm keys are now, that would push the palm keys. They might look like whammy bars on an electric guitar. If placed correctly, they would be palm keys for my big hands.