I think it's really bad idea to sort priotities by their name. It works for english language but for other (ie. polish) - not necessarily.
So here is my simple solution and that's how i've handled it :
file admincp/tickets.php, line 161 @$fetchpriorities = $db->query("SELECT * FROM ".DBPF."priorities ORDER BY name ASC");@
change to @$fetchpriorities = $db->query("SELECT * FROM ".DBPF."priorities ORDER BY id DESC");@
also, i want to ask anyone from Traq team to contact me on mbajur [at] gmail [dot] com cause i want to join this project and help you developing it. It has big potential, really! :)