qmk_firmware/layouts/community/ergodox/kastyle/readme.md

The kastyle keymap was originally intended to remap the ErgoDox EZ to more closely approximate the layout of a Kinesis Advantage. Notable changes over the stock ErgoDox layout include:

• Re-arragnement of tab, enter, space, and delete to match the Kinesis
• Addition of print screen, pause, etc. keys following the kines-ish keymap on L1
• GUI keys have replaced Ctrl on the thumb keys (for Mac use), and Alt keys are mapped to allow Esc on tap (good for Vi users)
• Most notably, the addition of a momentary one-handed mode for quick and easy access to keys on the other half of the keyboard, e.g. while using a mouse in one hand, one may add text to a dialogue box with the other without having to reach across the keyboard or remove one's hand from the mouse.