Yes, the Buynow settings and the html email templates are the only two places to modify the order comfirmation email.
	The cart uses one of the 3 following email templates when it sends the email confirmation. The email html templates located off your portal root directory in /desktopmodules/smith.buynow/
	
	    * OrderTemplate.htm – standard email template
	    * SHOrderTemplate.htm – email template used when shipping and handling is combined
	    * OrderSurchargeTemplate.htm – email template used when surcharge is enabled in the cart
	 
	Kevin