I see. Yeah, sounds like a one of the Dactyl Manuform's is in your future. :-) Given the parametric nature, it seems like you be able to tune it to your specifics.
For me, on the existing flat thumb ergos, hitting the thumb buttons with the side of the thumb actually feels normal to me in terms of thumb & wrist motion. The primary issue is the angles and arc of the splaying of the thumb to hit the keys without having to contort my thumbs any. This is my biggest issue with the Kinesis Advantage and ErgoDox.
The second biggest factor is that the tall Cherry style switches and keycaps requires a lot of travel distance for activation. One the more recent ergo boards, I've switched to lower profile switches and that makes a non-trivial improvement as well. My upcoming build is with the choc minis + low profile keycaps but with heavier springs so they feel more like the last generation of the 17" MBP keyboard (as opposed the crap that's Apple's done with their recent keys).
For me, on the existing flat thumb ergos, hitting the thumb buttons with the side of the thumb actually feels normal to me in terms of thumb & wrist motion. The primary issue is the angles and arc of the splaying of the thumb to hit the keys without having to contort my thumbs any. This is my biggest issue with the Kinesis Advantage and ErgoDox.
The second biggest factor is that the tall Cherry style switches and keycaps requires a lot of travel distance for activation. One the more recent ergo boards, I've switched to lower profile switches and that makes a non-trivial improvement as well. My upcoming build is with the choc minis + low profile keycaps but with heavier springs so they feel more like the last generation of the 17" MBP keyboard (as opposed the crap that's Apple's done with their recent keys).