I have keys for := and !=, and %q %s %d %v %w on a layer. I also move most of the symbols off the number keys / pinky fingers and on to home row. With a momen

I have keys for := and !=, and %q %s %d %v %w on a layer. I also move most of the symbols off the number keys / pinky fingers and on to home row. With a momentary layer toggle on the opposite thumb, jkl; becomes ({}) and uiop becomes &*`~. That's one of the best layout changes you can make, and it's also nice to move backspace somewhere where you don't have to reach. (I have it on my left thumb, but also had it on my right pointer finger, next to h, which I think I liked more.)