Hi,
When you use the "vendor default menu", the links generated for the "Sold by" will use the menu.
So, you can create a vendor listing menu and use it in your configuration.
At this moment, all the links for the "sold by" will use the menu and you will have nicer url like : "/vendors/vendor-name"
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.