i used this script with php for create users with your idea
-------------------------
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
<html>
<head>
<title>Crear usuarios en Ebox</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta name="GENERATOR" content="Quanta Plus KDE">
</head>
<body bgcolor="#ffffff" text="#000000">
<table style="border: 2px dotted gray;margin-right:auto;margin-left:auto;">
<?
$lines = file('alumnos');
?>
<tr style="text-align:center;background-color:#4a6890;color:#fff;">
<td>Usuario</td><td>Contrasenia</td><td>Nombre1</td><td>Nombre2</td><td>Apellido1</td><td>Apellido2</td></tr>
<?
foreach ($lines as $line_num => $line) {
$datos = explode(",", $line);
?>
<tr>
<td> <?= $datos[0] ?></td>
<td style="background-color:#cccccc;"> <?= $datos[1] ?></td>
<td> <?= $datos[2] ?></td>
<td style="background-color:#cccccc;"> <?= $datos[3] ?></td>
<td> <?= $datos[4] ?></td>
<td style="background-color:#cccccc;"> <?= $datos[5] ?></td>
<IFRAME src="
https://ip_ebox/ebox/UsersAndGroups/AddUser?username=<?= $datos[0] ?>&name=<?= $datos[2]." ".$datos[3] ?>&surname=<?= $datos[4]." ".$datos[5] ?>&comment=Alumnos&password=<?= $datos[1] ?>&repassword=<?= $datos[1] ?>&group=alumnos&add=Add
" width="1" height="1"
scrolling="auto" frameborder="1">
</IFRAME>
</tr>
<?
} //fin foreach
?>
</table>
</body>
------------------------
where file alumnos contain
user,id,name1,name2,surname1,surname2
i put this file in /var/www/some_name.php and execute http:/ip_ebox/some_name.php and voila!!! works fine