When you click the "add to cart" button for a product the form submits to cart.php?mode=add. I guess you could either have it redirect to cart.php?mode=checkout at the end of the add portion of the cart.php code or maybe add the mode=add functionality to the mode=checkout portion of the code.
I know this isn't any specific help, but maybe can help a little bit.
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X-Cart Version: 4.0.17
Linux 2.4.21-37.ELsmp
Apache 1.3.34
MySQL 4.0.25-standard
PHP 4.4.1
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