My sense is that the first scenario you listed probably would not fly, because it has a direct effect on the play of the game. At that time we were still not far from sponsor-driven gameplay issues in game shows. This would mean that people outside of the production company would be privy to a certain result of the game, so that would definitely be a no-go.
I am sure there were other aspects negotiated or even baked into the sponsorship agreement, all of which more favorable terms could generate more money: exclusivity in the product category, positioning within the daily lineup and which days of the week, etc. It would also make sense that they would be sensitive to their sponsor's concerns. If the sponsor, for instance, had a particular aversion to Cliffhangers, then I could see that the producers granting that request. Same if they had a particular aversion to pairing of prizes ("with this bar set comes a supply of eye drops").