Quoted from Monk:
I don't think it is necessarily coded into the game. When the SDTM from the magnet conversation comes up there are a few people that believe hitting the flippers changes how the magnet reacts and moves the ball in different directions. People have also said rotating the magnet changes the direction the ball will be thrown to eliminate the SDTM. When I owned the game I tried them all and sometimes it would work and sometimes it wouldn't. I really liked the game, but there were 2 or 3 things that frustrated me so much (3 drop targets on the left that wouldn't always go down when hit) I had to get rid of it before I took a sledge hammer to it.
FWIW, on my game, it's nearly a 100% success (to shoot the zombie) on the crowbar/Borg scene IF timed after the second crowbar strike, with a delay of the same time between the 1st and 2nd strike (as if making a phantom 3rd strike with the timing cue given from the first two). And a poorly timed flip can cause it to drop SDTM instead as well.
If lucky on the return, a second strike can be made, or at times this will wrap it around to make the Riot shot.
Makes sense other games may be a bit different, and tournament games often have the magnet off, but I've experienced it on more than just mine, so perhaps skewed personal results to the whole, but the flippers will definitely control the magnet to help against a SDTM, and seem to react differently, in a predictable manner based on timing.