You could use the added 13 key row as your F-key row. You are free to program it as you wish. The 129 key layout can be anything you want it to be. If the LED windows were moved on a g80/g81 -3000 case you could fit 133 keys. And if the F-key row spaces were removed you could fit 4 more on that and extra row below, totaling 137. I would rather stay at 129 to not mess with the layout.
I just looked at a picture of a leopold and there wouldn't be able to have the extra 4 above the numpad even. Same for filco. I'm seeing ducky's with 4 keys already there.
Maybe I'm just used to "mod room"... Call me old fashioned... I personally prefer the F-keys farther away, so the extra 13 + 3 would be macros or whatever. I don't want to accidentally quick save/load when I didn't mean it... stuff like that... And it's really only like what 6mm farther right?
If I have to I could take apart one of my g80's and measure and take pictures. Should I, or would I just be wasting my time?...
I did some digging and I got all the way back to 1999 for the idea of an individually controlled LED mechanical keyboard! It was DECK Keyboards! -
fredDarmstadt, Great idea(s), individualy addressable LEDs, a whole 104 keyboards worth. we looked at that in aprox 1999 and didn't do it as it's expensive, and we didn't know any 3rd party software developers who would REALY be interested. but maybe the time has come. In about 4 months, we will introduce a standard 104 key layout KB with the same 50 million cycle keys and the same LED backlighting as we have and the same negative image keycaps we now have. Hey keep those ideas coming. you can E-MAIL me at tech support.
TOM g
I think he was talking about the DECK Legend. Which is why in 2008 a guy made the Legend what it almost was.

Almost all of that will be internalized in the teensy and traces, I hope...