Transliteration, please.

That's a lot of hypens! I'm adding transliteration to the list of features to add. Thanks for the feedback!

I had this issue with 7.x-1.x version too. I have a patch for it which can be easily modified for 6.x.

This patch also removes dots, and replaces two or more hyphens with a single one.

My menu items are in cyrillic and the patch from #2 makes them appear in cyrillic too:
<li class="leaf контакт">
which is not ok, I don't want to have cyrillic characters in my css. So there's actually no transliteration gonig on...

Before the patch the additional css didn't appear at all, but there was one blank space instead:
<li class="leaf ">

If you want transliteration your menu items cyrillic names, you must added this function to end module file:

//
// transliteration from cyrillic to translit with UTF-8 encoding
//
function mb_transliterate($string)
{ 
		$table = array( 
								'А' => 'A', 'Б' => 'B', 'В' => 'V', 'Г' => 'G', 'Д' => 'D', 
								'Е' => 'E', 'Ё' => 'YO', 'Ж' => 'ZH', 'З' => 'Z', 'И' => 'I', 
								'Й' => 'J', 'К' => 'K', 'Л' => 'L', 'М' => 'M', 'Н' => 'N', 
								'О' => 'O', 'П' => 'P', 'Р' => 'R', 'С' => 'S', 'Т' => 'T', 
								'У' => 'U', 'Ф' => 'F', 'Х' => 'H', 'Ц' => 'C', 'Ч' => 'CH', 
								'Ш' => 'SH', 'Щ' => 'SCH', 'Ь' => '', 'Ы' => 'Y', 'Ъ' => '', 
								'Э' => 'E', 'Ю' => 'YU', 'Я' => 'YA', 
 
								'а' => 'a', 'б' => 'b', 'в' => 'v', 'г' => 'g', 'д' => 'd', 
								'е' => 'e', 'ё' => 'yo', 'ж' => 'zh', 'з' => 'z', 'и' => 'i', 
								'й' => 'j', 'к' => 'k', 'л' => 'l', 'м' => 'm', 'н' => 'n',
								'о' => 'o', 'п' => 'p', 'р' => 'r', 'с' => 's', 'т' => 't', 
								'у' => 'u', 'ф' => 'f', 'х' => 'h', 'ц' => 'c', 'ч' => 'ch', 
								'ш' => 'sh', 'щ' => 'sch', 'ь' => '', 'ы' => 'y', 'ъ' => '', 
								'э' => 'e', 'ю' => 'yu', 'я' => 'ya', 
		); 
 
		$output = str_replace( 
				array_keys($table), 
				array_values($table),$string 
		); 
 
		$output = preg_replace('/[^-a-z0-9._\[\]\'"]/i', ' ', $output);
		$output = preg_replace('/ +/', '-', $output);
 
		return $output; 
}

and then use this function in _make_class_name function, like this:

function _make_class_name($text) {
	// do main text conversion to class name,
	// then remove double hyphens or hyphens at beginning or end of class name
	$text = mb_transliterate($text);
	$text = drupal_strtolower(preg_replace('/(\s?&\s?|[^-_\w\d])/i', '-', trim(strip_tags($text))));
	$text = preg_replace('/(^-+|-+$)/', '', $text);
	$text = preg_replace('/--+/', '-', $text);
	return $text;
}