There are couple of things that I think can be made better:
1) This one is actually pretty annoying and messes me up - the colors-to-keys association changes when you change number of lanes. So in 4k j is pink and in 6k it's grey. Should always be same.
2)It's probably good idea to put some break between 2 middle lanes. Maybe use separator of different color or make it a little wider - I find myself pressing s and j instead of s and f sometimes for example. I'm sure I'll stop making this mistake eventually, but this is probably an easy change and great quality of life improvement.
1) This one is actually pretty annoying and messes me up - the colors-to-keys association changes when you change number of lanes. So in 4k j is pink and in 6k it's grey. Should always be same.
2)It's probably good idea to put some break between 2 middle lanes. Maybe use separator of different color or make it a little wider - I find myself pressing s and j instead of s and f sometimes for example. I'm sure I'll stop making this mistake eventually, but this is probably an easy change and great quality of life improvement.