Many times at ADS shows, the judge will indicate when you should salute, before and/or after the pattern. If not specified, we usually salute after, but in this case, considering that "return to the line at a trot" is part of the pattern, my guess is that the judge will not even be watching when you stop at the line up. They might start the next competitor even before you stop. That being said, you may be asked to start your pattern even when the competitor in front of you isn't finished. So this makes the roundness of the circles, the squareness of the halt, and the straightness and williness of the back the major aspects that the judge is looking for.
So I guess you are going to have to gauge if/when you can get the judge's eye and if it is appropriate to salute. I would NOT do it in the "middle" of the patten, say after the back, as that is not what is called for in the pattern. If you are the only one in the class, I would impress the judge and spectators and do a salute and the beginning and the end if you can have the judge's eye.
Otherwise, get a salute in during the inspection when the judge approaches. Gentlemen should remove their hat. THAT would be impressive in a breed show.
Myrna
BTW, we watched a large Regional Arab show while we were at the KY Horse Park for the CAA show. A while back after watching an AMHA show online, I was shocked that the drivers "collasped" in the line up. Those competitors at the Arab show "collasped" in the line up, too. So I guess it is a breed ring thing. We went back and watched the carriage show in the other arena, and those competitors didn't let down. It sure was neat watching those drivers all dressed up and "sitting pretty". The Arab line up looked like a mess (It wasn't even much of a line). Of course, over the weekend, I heard on the loudspeaker from the Arab show, "Calling class number 226, Half-Arab Western Sidesaddle Equitation for Jrs. 10 & under whose parents don't own the horse" (Just Kidding, but they did call over 200 classes!
How many different ways can you show a horse!)