For my preferred layout in QMK, I have Caps Lock mapped to Caps Lock only on tap, and Control on hold. I also have the right Alt key mapped to Backspace on tap, Alt on hold, to give me an additional backspace which I can hit with my thumb, keeping the rest of my fingers on the home row.
http://www.keyboard-layout-editor.com/#/gists/4d894ef5848c4f...