Adding 1 more argument to the payment form

Hello,

First all, id like to say you guys did an awesome job with this new ecommerce script.

I created a custom payment method, although when creating it I would've enjoy having an extra argument somewhere in the hook_submit_form.

That argument would tell us if the form is being callback from the administration or is it being called by a front end user. Adding the argument in the form: commerce_payment_order_transaction_add_form where the commerce_payment_method_callback is being called.

If there is one already please let me know.

Thanks.