I'm all in favor of people altering games. It doesn't matter if you make the game easier or harder, as long as you find it to be more fun. For example, I did the post mod on my TZ. This prevents the ball from bouncing out of the rocket. To me, this makes the game much more enjoyable. I would, however, caution against performing any mods that do irreversible damage to the playfield (i.e. adding a post between the flippers). In the case of my TZ mod, the game can be easily reverted back to its original configuration.