But you make a great point, that the non-shooter should be seated and not involved in the spotting. I told this very thing to both players so that they would be aware of it for larger tourneys like the Nationals.
If there is a referee present (whether at the table or available to run over), then I agree with this and neither player should be spotting balls or removing magic racks. Your league players should make sure to use the refs available at nationals.
However, if it is a league (or any other type of match) that does not have a referee present, then someone needs to take the place of the referee to do these tasks. One solution is to designate an available third party to act as a referee (which of course players often do when needing someone to watch a close hit).
But if one is not available, what should you do? Someonehas to take on the task of spotting balls or removing the template. Why should EITHER player be penalized because there is no referee and because they acted in the place of the referee? The analogy to cue ball in hand is not apt, in my view, because even with Michaela Tabb officiating she is not going to place the cue ball for you.
In the other thread, Bob Jewett talks about it being preferable that the non-shooter act as the referee. I think is the better option, as between the two players.
Regards,
Gideon