check out the 'tracktyls'.. The 'beast' (1) gets all the attention, but I actually like qqurn's stuff (2)(3) better. He even has a nice git repo with dactyls with trackball, electric eraser, and button based thumb clusters(4)

Oh - and the 'missing function keys' are because most of these boards are made to be used with a firmware like QMK - which lets you have 'layers'. So you have a layer with cursor movement, a layer with function, etc.

1) https://medium.com/@kincade/track-beast-build-log-a-trackbal...

2) https://imgur.com/a/TDE640k

3) https://www.reddit.com/r/MechanicalKeyboards/comments/g3aue6...

4)https://gitlab.com/keyboards1