I read most of the thread and am somewhat amazed at some of the responses. Why would games of skill have "tilt warnings" if it was not ok to move games around? Sure, there is good reason that Death saves AND bang-backs are banned from most all current leagues and competitive pinball.
HOWEVER, I have one request... If you don't nudge or wiggle the pinball game at all when you play...
If someone that you do not know asks you to play with them, please let them know this fact before you start. That way, they can be sure they know you don't care if you win and vise-verse.
Anyone that is not nudging or tilting is not trying to win and I have very little interest in playing pinball with people that don't want to win. Why even keep score?