Attaching comments to blog post promoted to front page I have 'blog posts' that are promoted to the front page. We would like to have the ability to have users posts comments on these posts through the front page without having to click through to get to the posts page.
The reason you do not see comment form on content promoted to front page is because by default comment form shows on full node view.So following code may help you.

function mymodulename_node_view($node, $view_mode, $langcode) {
  if(drupal_is_front_page() &amp;&amp; $node-&gt;type == "your_content_type") {
      $node-&gt;content['comments'] = comment_node_page_additions($node);
  } 
}