avalon451, I haven't been on ANY ride where a too small child is allowed in the line (or rather, the true part of the line, not the line that leads up to that person). It's why the swap passes were created!
The CM standing at the measuring stick at Indy has always been the person who gives out the swap passes. A too small child isn't allowed any further.
At Space Mountain I think it was the person up the ramp monitoring the line and the FP line. We've just gone up the ramp NOT in line, gotten a swap pass, and the first rider(s) go back down and get in line while the others do whatever they are going to do.
Dizneydaz I wish I knew or remembered about the other SR lines! I wanted to use it on Grizzly recently, but since the stand by line was only 5 minutes, it wasn't open (go figure). I did the single line on Splash but it was late and I was tired, so I don't remember if there was a pass.
I like getting the pass for Screamin'. I feel like I'm making the CMs day, b/c so few people seem to know about it (or will split up their group). I feel like I'm getting a mental high-5 from them. Then again, hubby had a BAD experience with Screamin' single rider line on the 29th, where the line got too long, so they took all the singles, put them on the elevator on that side of the loading platform, sent it up, then they shuffled over the tracks, got in the other elevator, and went down to a holding pen. It was obviously done b/c the single rider line was getting too crowded, and seemed to be a great idea, BUT the CM on the other side (the normal loading side) IGNORED THEM! The people who came into the SR line well after hubby and his "group" were getting on right and left while the normal loader CM refused to look at them or seat them. They finally had to call him over and ask what was going on before he did anything. It was kinda rotten!