Hi,
For the moment it is complicated to do it because the address edition in the checkout is quite different than with a popup.
It has to us the new ajax system that we have implemented in HikaMarket and recently in HikaShop (the order edition in the backend).
We planned to improve the checkout and change the way that the order are modified. I think this ajax system will be use.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.