I modified the original ot_loworderfee.php files and made it possible to charge a percent of the subtotal as a low order fee. It will also tell to customer the current minimum order requirement if the low order fee is charged. Using the same exact form as the original module, you can now charge a percent by putting a % at the end of a number. I have it installed on a live store right now, and it works perfect. It's made to work with osCommerce 2.2 MS2 I hope you find this useful. Enjoy.