1) class.shopkeeper.php -> function getTotal (about lines 380-410, changed some lines, so better do a search in your editor)
put this or some other transformation code:
$totalPrice=number_format($totalPrice, 2, ',', ' ');
before this
$output = array($totalItems,$totalPrice);
return $output;
2) the captcha does belong to the modx core, it’s no part of shopkeeper.
Try to change
return (string) $arr_words[array_rand($arr_words)].rand(10,999);
to
return (string) $arr_words[array_rand($arr_words)];
in file: manager/includes/veriword.php (Line 94 in MODx 1.0.4)