PayPal Pro Authorization and Capture

I have successfully set up eCart to link to my sandbox account. However, my client has now asked that payments are only authorised, not taken immediately. He'll authorise them in his PP account once they are ready for shipping.

Looking at the code generated by eCart - I can see that the following pages currently state:

--------------------- checkout.php -----------------------
$WA_PP_ECO_Set_params[0][$nextIndex] = "PaymentAction";
$WA_PP_ECO_Set_params[1][$nextIndex] = "Authorization";


--------------------- confirm.php -----------------------
$PP_DirectPayment_required[0][$nextIndex] = "PaymentAction";
$PP_DirectPayment_required[1][$nextIndex] = "Sale";


--------------------- pp_confirm.php -----------------------
$WA_PP_ECO_Do_optional[0][$nextIndex] = "PaymentAction";
$WA_PP_ECO_Do_optional[1][$nextIndex] = "Sale";


Do I simply change all of these to "Authorization" and then my client handles the rest from his paypal pro account.

Also - does the PayPal Express Checkout support authorization - or should this be removed and leave payments to be taken by card only in the eCart pages?

Thanks