On my Kinesis Advantage it's a lot more than four keys. And they definitely help.
The 12 thumb keys on the Kinesis is quite a luxury. I have:
Left hand: control, meta, command, hyper, super, backspace
Right hand: space, enter, command, hyper, super, del
The 12 thumb keys on the Kinesis is quite a luxury. I have:
Left hand: control, meta, command, hyper, super, backspace
Right hand: space, enter, command, hyper, super, del