The old NeXT keyboards had a key under the space bar. It was, I believe, a Command key when used on the Mac, but I have not used one in ages... Seems that I use

The old NeXT keyboards had a key under the space bar. It was, I believe, a Command key when used on the Mac, but I have not used one in ages... Seems that I use just one thumb out of two when typing (now my left after thumb tendonitis a decade ago) and only for space, so a good newly designed keyboard would give thumbs more to do. I believe several models of ergonomic keyboards do exactly this.