1. I've never seen this happen, but I've always recognized the risk. What would make it funny is if Team B's player was in the parking lot/bathroom/back room, etc. That's why, when I'm short-handed, I always make it very clear to my whole team to not reveal that. "Bill's sleeping one off in the car" usually works.
2. I did do a variant of this once in Vegas, and I thought it was brilliant, if I say so myself. We're up 2-1 after three matches and we put our 4 on their 7. That leaves me against their 5 or 6 (I forget which) in the last match. We had plenty of time for the entire match remaining. However, it quickly becomes clear that their 7 is stalling to force match 5 (me vs. their 5 or 6) to be a sudden death match. That was a smart move on their part, I think: I don't lose to a lot of legitimate 5s and 6s because the spot isn't all that big. So, I did a quick check with a ref, called a time out, and told my 4 to break down his stick and congratulate his opponent. Then I go on to a nice leisurely win.
That was the year we finished in 17-32, my best year in Vegas ever. We would have done better, but Eric, who posts hear regularly, beat me.
Cory