I too have had a baby suffer from impaction, only I wasn't aware of it until I received the the necropsy report and it was too late. This was a very very dear baby as well (Sharpe Sunglow). It happened to be my boa, not a corn... however the difference in size should tell you that just because they are bigger does not mean there is less risk. This baby was a 120g newborn BCI on aspen bedding, however she ingested just enough to cause impaction.
With a young corn, I would imagine that the risk is even greater, given their size. Therefore, I don't even try. They all get moved to smaller seperate bins for feeding... even the adults. I see it as more of a temperment conditioner for the adults though, just to make sure they don't up their feeding response and lose their manners. I don't see this as a disturbance to them, as they are handled very often. They are taught this routine from the 1st feeding, and as I see it, even receive a reward (food).
As was said earlier, it also gives me the opportunity to clean their bins thoroughly. Its much easier and more efficient to do this with an empty bin. In my opinion, shoving around the poor guys just to spot clean would be more of a disturbance with none of the reward of food.
This has also proven to help with dissassociating hand & food. I have bought many established corns that would strike 1st and ask questions later, only to find out that they were fed in their bins. Though I'm sure this wasn't the sole cause of their nippiness, I believe you can attribute quite a large percentage to it. When it comes to the larger species, particularly the "monster" snakes, I think this is a vital routine to be learned very early in life (and small in size). I would rather not have a 15ft long retic lunge for me just for opening the cage, thats for sure.
Now, there are exceptions to every rule, and many people will do what they have always done regardless. I had always known what the "advised" method was, but having a large collection, I decided to cut corners. Losing the Sunglow was definitely a kick in the gut. Not only was I out a very favored snake, but my wallet felt the drop too. It took something so horrible to make me realize that cutting corners can just be shooting yourself in the foot. In my case, it was a devastating limb lost.