Optional Bold/Italic etc... versions of the font not picked up in admin droopdown

The Font-family drop down in the admin settings for Cufon does pick up my Bold version of my font. A tempo fix was to to change the following lines in cufon.admin.inc from:

$fonts = array('------');
foreach (_cufon_discover_fonts() as $font) {
$fonts[$font] = $font;
}

to:

$fonts = array('------');
foreach (_cufon_discover_fonts() as $font) {
$fonts[$font] = $font;
$fonts[$font . ' Bd'] = $font . ' Bd';
}

but there should be a better solution as this would assume that every font has a Bold version available.