I've experimented with an old RA drive motor, attached to a the Crayford-style focuser of my Skywatcher ED100 (removed the focuser's knob, and attached the drive's rubber coupler on to the shaft) - then a lo-o-o-o-ong extension wire added on to the handset controller.
So that I could tweak the focus, while indoors looking at the computer screen - not exactly controlled BY the computer, but I could control it while sitting AT the computer.
Not sure whether you could couple such a contraption to a Mak focuser though. Is the focus knob removable, with a thinner metal shaft underneath?