I could never get my head around the numbers. I just have a custom layout where for 1,2,3,9,0 they are without shift, and for 4,5,6,7,8 they are with shift. So

I could never get my head around the numbers. I just have a custom layout where for 1,2,3,9,0 they are without shift, and for 4,5,6,7,8 they are with shift. So for me shift 1 is &, but shift 4 is 4. It actually works really well.