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In my instructor class (early this spring) the DPS said that if we wanted to shoot single-action, we had to wait until the time started to cock the pistol. I shot my S&W 586 almost completely single-action that way and had no problem completing all of the shots except for once when I apparently set the first-bullet in the string of 5 loaded, under the hammer when I loaded it. Of course, on my fifth shot it went "CLICK" instead of BANG, so I just double-actioned another shot once I realized what had happened, it went BANG the second time, and the targets turned right after that.

As far as I know, though, there is no rule, law, or common mandate that says you can't shoot a proficiency course single action, but... I would caution students that if they're doing this FOR REAL, then they might want to consider pulling the trigger first, instead of reaching up to cock the gun. Saves a little bit of time that way!