CC sale versus CC authorization

We know that the default transaction for PS3 is a sale type where the buyer's CC gets charged right away through a payment gateway such as PayPal, using their Website Payments Pro option.

Website Payments Pro can also handle CC Authorization transactions for the cases where product shipment is delayed (a week or so) due to assembly, as opposed to a CC sale type transaction for goods that are shipped within 24 hours. In the former case funds are placed on hold and captured at the time of shipment. In the latter case of course the CC is charged right away.

According to PayPal, the shopping cart and/or checkout process used would need to flag the transaction as an "authorization" instead of a "sale". Is there code within PS3 that can be edited to mark a transaction appropriately? Something like:

paymentAction=sale;

changed to:

paymentAction=authorization;

Thanks,
Robert