Cameron Silver worked on CV Home roms in his own time years after CV was released to pad the game out. Not sure of the legalities of whether Williams gave approval for this but the roms are set up as Free Play only so not really practical for onsite installation. What I have noticed is that neon multiball rarely comes up as a mode challenge in lieu of the slightly mundane Simon Says copycat mode.
The 9.4H TZ roms have similar enhancements and I believe the only way you can play a machine with a functioning 3rd magnet via the game software. Apparently you can can also lock a flipper coil in the hold position whilst a ball is being cradled, but I've never been game to try this for any extended period of time.
Here's the 9.4H multiball sequence being manually triggered on mine:
Was this thread started as a result of the "Where's The Code?" campaign currently in effect?