I only seem to be able to get this to work if I de-select "Show insert button and hint text" but then the problem is that users don't know that they have to click the little arrow on the left hand side of the section to add their next line....
If I leave the "Show insert button and hint text" people will click it, but when that exposed it adds the line under and not above.. In the customized commands area I have deselect everything under insert and insert below...