maybe change Right shift options to supported layouts to cover some other distinctions, I would do it just don't know how to do the fancy tables and have a legend, i.e. WKL - 1.5-1-1.5 bottom row, HHKB - split r-shift + 2x1u backspace, STP - stepped caps lock support
I thought about caps lock but they all do both so I didn't add it. Just looked and they all support split backspace too, so unless I'm missing some boards there's no point adding that either.
Bottom row would be good to add, can you think of any options that can't be made by looking at these? Might need to split them up more if the left side works but the right doesn't...
Raw keyboard-layout-editor code below for portability.
More
[{a:6,w:0.5},"1",{x:0.5,a:7,w:1.25},"1.25",{w:1.25},"1.25",{w:1.25},"1.25",{w:6.25},"6.25",{w:1.25},"1.25",{w:1.25},"1.25",{w:1.25},"1.25",{w:1.25},"1.25"],
[{a:6,w:0.5},"2",{x:0.5,a:7,w:1.5},"1.5",{w:1},"1",{w:1.5},"1.5",{w:6},"6",{w:1.5},"1.5",{w:1},"1",{w:1},"1",{w:1.5},"1.5"],
[{a:6,w:0.5},"3",{x:0.5,a:7,w:1.5},"1.5",{w:1.5},"1.5",{w:7},"7",{w:1.5},"1.5",{w:1},"1",{w:1},"1",{w:1.5},"1.5"],
[{a:6,w:0.5},"4",{x:0.5,a:7,w:1.5},"1.5",{w:1},"1",{w:1.5},"1.5",{w:7},"7",{w:1.5},"1.5",{w:1},"1",{w:1.5},"1.5"]