I would like you contemplate this for future version.
I enrichement triggers with custom macros.

PHP program: include/triggers.inc.php at line 1763 i include the next

$sql_tino = 'SELECT hm.macro, hm.value from hostmacro hm, hosts h where h.host=\''.$row['host'].'\' and h.hostid=hm.hostid';
$res = DBselect($sql_tino);
while ($row3 = DBfetch($res))

{ $description = str_replace($row3['macro'], $row3['value'], $description); }

what do you think?