Opinons on the X-keys 84 and 128 keyboards?

I would think it would be smarter to simply use modifier keys. See my layout on my FAQ. The little PVP icon is my modifier key, which doubles the amount of keys but keeps everything in reach. You could triple or even quadruple it.... Up to 7 layers if you really wanted to.

I had been meaning ot message you about your key layout Xzin. By modifier key I assume you mean toggle the 'second layer' or the 'red layer' on the X-Keys Pro?

And by up to 7 layers I assume you mean making CTRL / ALT / Shift combos for all the keys?

-Dan