In the file sf-options.php you can find code like such
'options' => array(
'Arial' => 'Arial',
'Courier New' => 'Courier New',
'Georgia' => 'Georgia',
'Helvetica' => 'Helvetica',
'Lucida Sans' => 'Lucida Sans',
'Lucida Sans Unicode' => 'Lucida Sans Unicode',
'Myriad Pro' => 'Myriad Pro',
'Palatino Linotype' => 'Palatino Linotype',
'Tahoma' => 'Tahoma',
'Times New Roman' => 'Times New Roman',
'Trebuchet MS' => 'Trebuchet MS',
'Verdana' => 'Verdana'
you can try adding your font by following the same structure as used for the other fonts.
Cheers