I don't agree with you unless the clock is visible and can be stopped like in other sports. IMO, I wish the umpire would keep the clock and add time when he saw stalling without letting either coach know. IMO, it is not part of the game, it is just a mechanism to keep the games mostly on time.
I remember watching a youth basketball game where the tie-breaker was points allowed. In the final game, one team held the ball both halves and won the game 4-0 over a clearly over-matched team. The other team got one shot off. It was within the rules of the game but not the spirit. The coach of the stalling team was rightly called out by fans at that game as well as fans from other teams. I happened to be there rooting for that team, understood why he did it, and apologized to the fans of the other team for the poor sportsmanship.
Rules shouldn't have to be made to prevent the 5% that abuse those rules. IMO, if you are going to stall in softball, don't be so obvious about it.