I really like this. I hate moving my fingers off of home row, and have a bunch of "layers" to put more keys on home row (extra thumb keys on the opposite hand define what; for example, I have ({}) on jkl;). I hadn't had the idea to "arpeggio", or to optimize normal letters, but now that seems really appealing to me. (I tried the demo and I love it.)

What's nice about having the full keyboard is that you can keep normal keybindings and just not use them when you're feeling lazy. I'll have to play with this more, it's a really good idea.