Once you start to explore the possibilities of programming a keymap, you’ll quickly find out that a lot of functions don’t really require dedicated keys. Using a thumb key as a layer modifier, can bring your arrow keys right under your finger tips on the home row, like on I J K L
. The reason you see so many tiny keyboards (36-40 keys) on here, is a consequence of optimizing custom keymaps; more keys simply become redundant (everyone will find some kind of sweet spot here, 36 keys isn’t for everyone). Something like the Raise or Defy is a good place to start experimenting with that, with minimal barrier due to the familiar layout. I do recommend picking something with a thumb cluster at minimum, because that will really open up a lot of possibilities and flexibility in experimenting with your layout.
How useable do you find the extra outer key, and what do you use it for?
I’m working on my own TAIPO inspired layout, trying to make it more functional for CAD use, and for optimization of modifiers an extra key would be useful. An extra thumb key was my first thought though.