I would like to only affect the placement of commas in a column list, without applying other formatting options. This would work similar to Ctrl-B, Ctrl-B to remove brackets or Ctrl-B, C to insert semicolons, in that no other formatting would take place.

There are times I have a rather well-formatted script but it has been written with commas at the start of the line and I prefer them at the end. A new shortcut would toggle placing commas at the start or end of the line without affecting other formatting within the script.