Programmatically set the defaults for a new content type

When programmatically creating a new content type I would like to set the default publishing options, comment settings and upload settings, as the content type is installed, so I create a dot install file for the content type with the following:

function custom_module_install() {

  // Disable promote to front
  // Read http://api.drupal.org/api/function/node_object_prepare/6
  // could be variable_set('node_options_'. $node->type, array('status', 'promote'));
  variable_set("node_options_my_content_type", array('status'));


  // Disable attachments

  // Read http://api.drupal.org/api/function/upload_nodeapi/6 on "load"

  variable_set("upload_my_content_type", 0);



  // Disable promote to front for this content type

  // Read http://api.drupal.org/api/function/comment_form_alter/6

  variable_set('comment_my_content_type', COMMENT_NODE_DISABLED);



  // Install schema as usual (if any)

  drupal_install_schema('custom_module');

}

I want to give a nod to chirale and his article: http://chirale.wordpress.com/2009/12/07/disable-upload-and-comment-for-a-new-content-type-programmatically/ for the heads up on where to look to get this sorted.