Add a trackpoint to ferris

[cmpute]

I was attracted by ferris at the first glance, and I thought it will be the perfect killer for EDC programming/office working if a trackpoint (integrated or interface) can be added to the keyboard!

I have collected some information:

• Using thinkpad modules: Project 1, Project 2, pin maps, vendor
• Using piromoni trackball: Kyria-based project, Sofle-based project, module link
• Using sprintek module: Thinkeys Project, module link

I think the space left under the palm can be an option to put the trackpoint module.

[hochshi]

Hay, You can check out my crkbd variant: https://github.com/hochshi/crkbd/tree/main/corne-light-choc-mini-trackpoint. I hope to finish designing the pcb by next week, I came to a similar conclusion and will try to connect the trackpoint controller board below the row keys, to the left of the thumb cluster.

I'm planning on supporting placing the sensor at each of the 3 thumb positions and in the far-index column.