I do this as well.

on top i often do a pad entry so that the elements are all on their own line

  SELECT 1 as pad
    , a
    , b

then i can reorder lines trivially without stopping to re-comma the endpoints or maintain which special entry is on the line of the SELECT token

what would be helpful is both LEADING and trailing commas

so I am suggesting:

  SELECT
    , a
    , b

would be permissible too. The parsing step is no longer the difficult portion.

Developer ease leads to less mistakes is my conjecture.