Been using the Advantage for decades. Splitting the two sides is a terrific idea. Always wanted to mount a split keyboard to the sides of a zero-gravity chair so will try it out with this.
Two features I wished they would offer:
1. A nub-mouse like the Thinkpad
2. A touchpad in the center of the keyboard (not needed for the split)
Yes, I've even given them feedback asking for a nib or something somewhere. I used velcro to attach a trackpad to the middle of one of my Advantage2 keyboards and it helps. (If I had my personal choice, it'd probably be a trackball instead of a nib.)
Two features I wished they would offer: 1. A nub-mouse like the Thinkpad 2. A touchpad in the center of the keyboard (not needed for the split)