I too must confess to doing this! My son & I do not like RnR, so use our tickets to get extra fastpasses for my husband & daughter. However, after we go off and ride GMR, we do usually buy a snack or souvenir while waiting for the others to finish their "2nd" ride.
I'm guilty of this crime too, my youngest is too small to ride RnR, We still get a fasspass for him and myself. The two of us go for a walk usually to the candy store and get a drink, while the others ride it twice. Like Marcia, I don't think its too bad we do go spend while we are waiting.
I've done this too, but I don't see it as cheating, or anything one must "confess" to or admit being "guilty" of. My wife and I haven't gone yet with kids, but there are some rides she won't ride, so I have used her pass to get an extra fastpass for me so I can ride twice. I don't consider it "cheating" in any way, since each ticket holder is entitled to use of fastpass, so if one ticket holder wants to give their fastpass to someone else, so what? To me, it's no different than accepting a free fastpass from a random guest who has decided that he doesn't want to ride again after all.
As far as using extra tickets from previous visits, I thought of that one, too, but found out it doesn't work. No, it won't erase a day off that other ticket, but it just won't give you a fastpass. That ticket has to have been scanned through the turnstyles before it can be used to get a fastpass. On our last trip, my wife was back in the room taking a nap, and I'm not much for midday naps, so I got the bright idea that I would hop a bus to Epcot (the park we were going to later that evening), go to Soarin' real quick and put each one of our tickets in so as to get our fastpasses for the evening, figuring that by the time we got there, fastpass would be closed out for the day, then go back to the hotel. Then, later, when we went to Epcot, we could just walk up to Soarin at the scheduled time and ride with no problem. Problem is, I totally forgot that the card has to run through the turnstyles first, and I remembered pretty much right as I was going up to the turnstyles. :lol:
And for what it's worth, if you get held up somewhere else and arrive at your attraction a little late, I don't see anything wrong with going in anyway, after the time window. If the CMs are willing to let you in, then so what? :shrug: But that's a subject for another debate, I reckon.