I'm in the camp to wait until shed is done.
Both the shed as well as digestion is a "work out" for the snake's system. Why stress it with a double whammy? Not to mention during shed they may use resources in their body that may also be needed for digestion.
On top of that, rolling old skin over a "bump" in the body, might be harder then slipping out of it without a bump.
I know many feed during shed, and have no problems. I just rather wait![]()