Hi,
It could be possible yes ; but generally, the shipping method selection require to have the user address.
So it is better at this moment that the user be already logged. Otherwise, once the user will be logged, his shipping select can be lost (due to an address modification in the session).
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.