I am probably beating a dead horse with this, but I personally have a love/hate relationship with Elusive Targets. I understand the purpose is to make it a challenge, but I would like the ability to replay previous targets. This allows for players to try more ways to take them down, and if they made a mistake that cost them Silent Assassin rating, to achieve that rating. Maybe release it as a Add On pack? This also allows for players who did not get the game at launch to try their hands at them as well (got a friend to get the game just recently).
I just had a distraction sound bug and pull the wrong person from another part of the building and found the knocked out target and cost me my SA Rating, even with all of my other careful planning.