Adding time to the clock in a situation like this is quite common, now that officials have replay to consult. I'm not an official, but have watched enough games to see this happen on several occasions. There are even times were a made 3 point shot will be reviewed during the next stoppage of play to determine if it was actually a 3pt FG, rather than a 2pt FG.
As for the call on the play in question, I think it was a good call. It was also a smart play by Kampe. Risky, but smart.