Gday David .

Yes, I see function 35 is the go re Special , thanks.

As for Multiball in Multiplayer mode ..
The manual says ..

"Making eject hole when flashing locks up ball and new ball released per following order:-
From ball ramp
From flashing eject hole
From unlit eject hole
To minimise multiplayer interaction lit and flashing eject holes are reallocated from ball to ball as required : Flashing lamp to empty eject hole if possible, lit lamp to occupied eject hole if possible ."

What I have observed is if 2 balls are already locked (say by player 1) and player 2 locks the last ball, then machine unlocks one of the locked balls (has no choice of course) , but I forget the rest of the finer details .
Will have to be more observant next time .
I usually drink too much when playing too  .

Funny, we are both David, both Fire Power tragics and both live in Sydney