[bazzargh]

If you've got a keyboard with QMK firmware, and mousekeys were enabled for it... you can just turn it on with https://www.caniusevia.com/ . One of my machines didn't have a mouse, so my next keyboard was a Keychron Q2 https://www.keychron.com/products/keychron-q2-qmk-custom-mec... - I thought I was going to have to recompile the firmware for this but it's already on: https://github.com/Keychron/qmk_firmware/blob/master/keyboar...

...you just need to map keys. It was very easy, so now fn-arrow and fn-return work as a mouse on anything I've attached it to so far. I got an rpi recently, only connected this, and was able to navigate the startup ui with no mouse.

[gryn]

works on ZMK firmware too just not the main repo, but one of the forks mentioned in the main repo.

the advantage with this is that it's cross platform.

[rgoulter]

I think the biggest disadvantage to "do it in firmware" is it requires an external keyboard. (& the good ones which let your thumbs use more than one key are more expensive or diy).

Using the keyboard to drive the mouse isn't a nice experience. -- But, it's nice to have in situations like "I use a bluetooth mouse, on desktop, and bluetooth isn't set up/working". I've found that useful for live ISOs.