The main function now updates bbs.node_action to NODE_LFIL to indicate that the user is listing files.  bbs.node_action is restored to the previous value upon exit of the main function.
Also I forgot to mention in my last commit that I added an optional command-line argument to specify a file directory internal code so that this script can (optionally) start at the file list for a file directory rather than the file group chooser.  This allows a command shell to run this script for the 'List files in directory' command (with bbs.curdir_code as the first argument).