Been configuring my brand new KBD67 for the last couple of days.
When using QMK on my own Linux system, backlight LED commands didn't work, and the caps lock indicator LED also never comes on. I also had a problem with MT(KC_RALT, KC_APP) on my right alt key. I've used this before on other keyboards to make right-alt double as a compose key. On the KBD67 it had an odd side effect, as it registers both Alt and Shift when held down. That's a problem because one program I use heavily has Ctrl-Alt-S and Ctr-Alt-Shift-S as two completely different commands!
I set up the same thing with the web configurator, and that problem went away! However, it still didn't get any of my LEDs working.
I tried to download the source, thinking that would let me see what the web tool did differently from my own efforts, but it tried to download a huge zip file (the entire QMK distro?), and then the download always fails. Not sure if I understood how that is supposed to work.
Got to say the web tool is a lot less work than I went though creating my own keymap source files.