I have hold/tap set up on all my modifiers on my Iris[0]. I got the idea from the (modern) Space Cadet[1] keyboard. From inside to outside my thumb buttons are

I have hold/tap set up on all my modifiers on my Iris[0]. I got the idea from the (modern) Space Cadet[1] keyboard. From inside to outside my thumb buttons are (when held) Command, no hold key, Option, and Hyper (where hyper means all 4 modifiers at the same time. On tap they all do things I use a lot: the command keys are Esc and Enter on left and right. The no-hold-keys (that my thumbs rest on) are backspace and space. The option keys are opening and closing braces. The hyper keys are opening and closing angle brackets, but since I don't do any JSX or Html any more I might make those square brackets. I have control keys just outboard of where my pinkies rest (where you'd normally find capslock and apostrophe) and those are, respectively, double quote and apostrophe on tap. Shift are in the normal place but on tap they are parentheses. In other words: every key that has a hold behavior also has a tap behavior. Several keys with tap behaviors also have hold behaviors for switching layers: home row left hand keys change the right hand to arrows, numbers, or symbols. [0] https://stevelosh.com/blog/2012/10/a-modern-space-cadet/#s17-shift-parentheses https://stevelosh.com/blog/2012/10/a-modern-space-cadet/#s17... [1] https://keeb.io/products/iris-keyboard-split-ergonomic-keyboard https://keeb.io/products/iris-keyboard-split-ergonomic-keybo...