Wish: Add Charset Option

We ran into an issue with PayPal where setting the Language Encoding to UTF-8 was not enough to handle french accent characters and had to add code in wp_ultra_shopping_cart.php on line 616 for the following:

<input type="hidden" name="charset" value="utf-8">

It would be great to add either a filter to the paypal form code for us to hook into it and add our own options or have the charset as an option in Configuration for the plugin.