I was thinking about insert into onNewTicket function the creation of a new user (if not existing) getting data from custom fields and add this user as collaborator.Could this work in your opinion?Thank you! Sorry for my insistence but I really need this feature

Thank you anyway!I've done it!

Is a bit ugly but it work.I've created a custom field (required) in the new ticket cusom form named "CC Email".I've done a bit of reverse engeneering on the database and I noticed that the CC emails entries are stored in "form_entry_values".Practically I added a query for that data at the beginning of "onNewTicket" function ( \include\class.ticket.php):- I select the last entry of that db table where "field_id" is equal to the "CC Email" field id in the table "form_entry_values" - I match the email with the existing emails (make sure to not create two identical users), if it already exist I create a new collaborator associated to this ticket with user_id (matched with the emil in the users table), if it not exist I create a new user with that email and I create a collaborator with his id- When collaborators are added I notify the creation of the ticket to customer and collaboratorsLet me attach some code to be more clear.//-----------------------------------------------------        $sql= "SELECT value,entry_id FROM ost_form_entry_values WHERE field_id='50' OR field_id='51' OR field_id='40'        ORDER BY entry_id DESC LIMIT 1;";     //select CC email        $risul= db_query($sql);        $emailrif = db_fetch_row($risul);    //extract CC email        unset($risul);        $sql= "SELECT user_id FROM ost_user_email WHERE address='$emailrif'";   //already exist?        $risul= db_query($sql);        $idesist=db_fetch_row($risul);        if (isset($idesist))      //if exist        {            if($idesist !== $this->getUserId())//la mail è uguale a quella del cliente?            {                $sql= "SELECT id FROM ost_ticket_collaborator ORDER BY id DESC LIMIT 1;";//seleziono ultimo id collaboratore                $risul= db_query($sql);                $icoll = db_fetch_row($risul);                $icoll+=1;                $idchiam= $this->getId();                $sql="INSERT INTO ost_ticket_collaborator (id,isactive,ticket_id,user_id,role) VALUES ('$icoll','1','$idchiam','$idesist','M')";                db_query($sql);//creo collaboratore con id user che esiste già            }        }        else //not exist        {            $sql= "SELECT id FROM ost_user ORDER BY id DESC LIMIT 1;";//seleziono ultimo id user            $risul= db_query($sql);            $iduser = db_fetch_row($risul);            $iduser+=1;            $sql= "SELECT value,entry_id FROM ost_form_entry_values WHERE field_id='42' OR field_id='46' OR field_id='39'            ORDER BY entry_id DESC LIMIT 1;";//seleziono persona rif            $risul= db_query($sql);            $persona = db_fetch_row($risul);//estraggo persona rif            $sql= "INSERT INTO ost_user (id,org_id,status,name) VALUES ('$iduser','0','0','$persona');";//creo user            db_query($sql);            //------------------------------            $sql= "INSERT INTO ost_user_email (id,user_id,address) VALUES ('$iduser','$iduser','$emailrif');";//creo email            db_query($sql);            $sql= "UPDATE ost_user SET default_email_id='$iduser' WHERE id='$iduser';";            db_query($sql);            //creo collaborator            $sql= "SELECT id FROM ost_ticket_collaborator ORDER BY id DESC LIMIT 1;";//seleziono ultimo id collaboratore            $risul= db_query($sql);            $icoll = db_fetch_row($risul);            $icoll+=1;            $idchiam= $this->getId();            $sql="INSERT INTO ost_ticket_collaborator (id,isactive,ticket_id,user_id,role) VALUES ('$icoll','1','$idchiam','$iduser','M')";//creo collaboratore con utente appena creato            db_query($sql);        }if($autorespond                && $cfg->autoRespONNewTicket()                && $dept->autoRespONNewTicket()                &&  ($msg=$tpl->getAutoRespMsgTemplate())) {            $msg = $this->replaceVars($msg->asArray(),                    array('message' => $message,                          'recipient' => $this->getOwner(),                          'signature' => ($dept && $dept->isPublic())?$dept->getSignature():'')                    );            $email->sendAutoReply($this->getOwner(), $msg, $msg,                null, $options);            $sql="SELECT address ".                 "FROM ost_user_email, ost_ticket_collaborator ".                 "WHERE ost_user_email.id = ost_ticket_collaborator.user_id ".                 "AND ost_ticket_collaborator.ticket_id = '$idchiam';";            $risul= db_query($sql);            $collabor = db_fetch_row($risul);            foreach ($collabor as $dest)                $email->sendAutoReply($dest, $msg, $msg, null, $options);                                }