[__MatrixMan__]

There's a lot of fun to be had by replacing the spacebar with four keys.

Mine are tab, esc, space, backspace... plus layer shenanigans (https://configure.zsa.io/planck-ez/layouts/jDnba/latest/0)

[eru]

On my Kinesis Advantage it's a lot more than four keys. And they definitely help.

[spudlyo]

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