What to do with submodules?

I wrote a small ogm submodule today for a client which helps og_mailinglist work with og_forum. I'll include it below in case anyone is interested but this raises the question of what to do with these various submodules which will need to written for og_mailinglist to work for various use cases? Add them to the OG Mailinglist project or push them out into their own projects?

name = OG Mailinglist OG Forum
description = "Modifies incoming emails so they'll be placed in the default group forum."
dependencies[] = og_mailinglist
package = "Organic groups"
core = "6.x"

/**
 * Implementation of hook_og_mailinglist_save_node_alter().
 */
function og_mailinglist_og_forum_og_mailinglist_save_node_alter(&$node) {
  dd($node, 'node in og_forum_alter');
  dd(current($node->og_groups), 'og_groups value');
  $forum_id = db_result(db_query("SELECT tid
                                  FROM {og_term}
                                  WHERE nid = %d", current($node->og_groups)));
  $node->tid = $forum_id;
}