Take messages generated by module and print them inside the node teaser?
My suggestion is:


Change this line in hook_node_view()
if ($view_mode == 'full' AND user_access('renew own pay to publish nodes')) {
and add $view_mode == 'teaser' to it. Then you can create a patch and submit to community, if you think that this feature may be needed by other users.
You can create a template file for this content type, store the messages in a theme variable and display them in template file, just use &lt;?php print $VARIBALE_NAME ?&gt; You also have to write a template preprocess function where you will write code to get message body.


I think second option is the best. The requirement is not generic and changing the module is not right in this case. However, you can search the module's issue queue for this.

References


function template_preprocess_node
Drupal 7 Template (Theme Hook) Suggestions