Hi,
That feature is already in the HikaMarket TODO list ; like the management of the carts/wishlists and the management of the waitlists.
Because very few people asked it, these task does not have a high priority.
There is no fast way to add the support ; it requires new ACL/controllers/views like for the other features in HikaMarket.
For the email edition and the HikaShop part ; I think that it should be possible to add a link in order to automatically approve the comment via the backend.
So the admin would have to click on the link and log-in if not already authenticated.
But for part, the HikaShop support team will be more appropriate (so best would be to create a new topic in the HikaShop forum section).
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.