Hello,
This can be done... however this will imply some source code modifications that i do not recommend due to the fact that you will lose them upon updating to a newer version.
You will have to edit the jos_rstickets_tickets table, edit ticket status > add the new items.
After you have done this, you will have to edit the following files:
/components/com_rstickets/page/search_tickets.php
/components/com_rstickets/functions.php
/components/com_rstickets/page/ticket.php
/components/com_rstickets//page/tickets.php
search for :
$status_array = array('open','on-hold','closed');
and add the new items, for example:
$status_array = array('open','on-hold','closed','test');
/components/com_rstickets/lang/english.php :
$status_array_lang = array('any' => LBL_ANY, 'open' => LBL_OPEN, 'on-hold' => LBL_ONHOLD, 'closed' => LBL_CLOSED, 'test' => 'TEST');