I have looked, and the only switches closed when the game is idle are the trough switches. It might be a momentary switch closure due to vibration, but I'm not sure how to track that down other than going into switch test and banging on the playfield.
Historically, the knocker means you won a free game. On match, it's usually a single knock (single credit), and it's usually right at the moment that the match value is displayed.
For replays, I think it's right as-is, but I can't really remember whether it's knocking once or twice. Once is normal.
Extra balls, I've seen both ways. Some games knock, others don't. Whichever way you choose, it should probably be a single knock, based on convention.
Usually, games will also allow the operator to award credits for high scores. Often the number of credits is configurable for each position on the high scores list, and you'll knock for each credit awarded.
Quoted from FawzmaGames:
with V014, adult flip code is being replaced with "Auto Adult" This is an option you can turn on or off in the main settings. When on, holding the left flip and start button at power up will turn adult mode on.
That will be awesome. I'm excited for the update.
Thank you so much for the attention to detail and willingness to listen to feedback. Like other have said, it's very refreshing.
I'm sure you're internally keeping a list of changes and assigning priority to them. The knocker changes are LOW, LOW priority. Anything you guys are working on to improve the scoring balance would be highest on my list. If you would prefer feature requests and bug reports sent somewhere else, I'm happy to do that instead of posting here.