Hi,
The vendor listing could be done using a category listing.
HikaMarket could create category for each vendor and would keep a link between a vendor and his category (and include his products into during creation).
So it's better to create a category listing for this.
About the unique vendor, I thought that I made the XML but no, I forgot it.
So it would be fix in the next package.
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.