Reade.md for what I want from an Iris perfect layout

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mouse keys
media keys and media controls
in-switch LED intensity controls (+/-)
underglow RGB hue/color controls
underglow RGB intensity controls
familiar key arrangement with Enter and symbols on the usual keys (to the right hand side)
navigation keys should be the vim ones really, and same ones used for mouse;
also have alternates on the same layer, in the form of AWSD, as well as HJKL (keep in mind the order is Left, Up, Down, Right)
arrow keys on one layer, however with another modifier key, they become left=home, right=end, up=page up, down=page Down

See keymap.c for layouts