A young boy at my church was wearing his shoes during the "Tamgeed" for St. Mary's fast a few weeks ago (in the front area where the chanters stand. . .wtv it's called) and when I told him to take it off he said: "This isn't the altar, abouna said it's OK." Of course, at that point I couldn't do anything. I also knew that abouna was technically correct.
So, can chanters wear shoes so long as they don't enter the sanctuary?