Was always my first tweak to a new machine - such an obvious change. Moving to a split keyboard gave me three keys at each thumb - the same kind of realization. We have two thumbs that most keyboards map to a single space bar. The thumb is a really solid finger for modifiers.
Another nice thing about a custom keyboard is not needing to map the keys - it's in the firmware.
Another nice thing about a custom keyboard is not needing to map the keys - it's in the firmware.