Quoted from MikeS:
I think it's both. Most changes are his ideas and vision from the start but I know Lyman has taken suggestions from the Sharpe's and other tourney players regarding score balancing and tournament strategies . If he sees tourney players abusing a scoring strategy/exploit he will at least try to correct it. I know Dwight listens for feedback as well. He put KME's suggestion for switching the flippers back via the captive ball during mass hysteria multiball in GB.
Since David is new to the hobby and not a tourney player I hope he will at least listen to ideas from the community. I think the framework of the rules/general vision should be all him but suggestions to balance rules/reduce exploits should be considered. For example if 1000corpses MB is too valuable maybe try to reduce the scoring a bit and bring up scoring in other modes via multipliers. As long as the code is somewhat balanced and has some risk/reward I wll be happy!
Risk/reward is an element of addictive gameplay.
Also when in a mode and there is an opportunity for real big scoring due to multipliers and going deep into the mode. Means that chopping wood feeling is removed from a game.
Looking forward to some new videos.