You might check out the 4E "Sim Dreams and Nightmares" digital supplement, which has some background info on simsense and skillwires. I don't think it covers recording knowsofts, though.
I imagine creating a skillsoft would require someone with a skilljack, a simrig, and the relevant skill to be recorded practicing it over the course of several months, probably with coaching by a director. The rating of the skillsoft would be limited to the level of the skill, and higher ratings would require more time (a month per point, minimum?). Then a team of experts (simsense producer, software engineers, cyberneticists, others) would have to process the sim-recordings into a usable skillsoft, which would take even longer.