Tarek,
It's just been held up slightly as it's become clear that the global settings are great but a lot of people need to be able to override them per order as well. So I'm just finalising the changes so if you select it on the settings page it will be the default on the order edit page but then allow you to also change it for that particular order.
As for an ETA I would expect it to be finished this week, along with possibly the new "Order Change" email template I have talked to some users about implementing.
Thanks,
Ryan