[TYPO3-commerce] extend mail templates

[Wild Wild Web - Internetservices]

Hi,

I'm wondering if and how one could add additional data to the order 
email templates.
What I am missing are markers to include the order date and time and the 
website name, plugin.tx_commerce_lib.defEmailSendername or URL.

Also, some of the customers have a costumers number from orders made by 
postal mail or telephone.
I would like to provide the possibility that customers having a 
costumers number can add them to the system during registration process.
And then of course I'd need a marker in the email templates and a way to 
include these customers number to each order mail.

Somebody was confronted with this kind of problem already and found a 
solution?

regards
Heiko