[Marvin Hlavac]

Yes, here's what I did:

1. Download the following product: https://vborg.vbsupport.ru/showthread.php?t=228623

2. I created a new user group (user group 15 in my case)

3. I added two instances of (is_member_of($vbulletin->userinfo, 15) AND into the downloaded above mentioned product's XML file:

    <![CDATA[ if (THIS_SCRIPT == 'editpost') 
{
    if (is_member_of($vbulletin->userinfo, 15) AND ($vbulletin->userinfo['userid'] == $postinfo['userid']) AND $foruminfo['ls_edit_ind']) 
    {
        $vbulletin->options['edittimelimit'] = 0;
    }
}  ]]>   
   </phpcode>


   </plugin>


  - <plugin active="1"  executionorder="5">
   - <title>
  - <![CDATA[ Set $post['editlink'] to true for First Post  ]]>   
   </title>


    <hookname>postbit_display_complete</hookname> 

  - <phpcode>
  - <![CDATA[ if(is_member_of($vbulletin->userinfo, 15) AND ($this->post['userid'] == $vbulletin->userinfo['userid']) AND $this->forum['ls_edit_ind'])

(Replace the two instances of the red #15 above with your own user group ID.)

4. Install the product