Hello,
There is no "waitlist" support in HikaMarket but that's something we can add in our TODO list for future improvements.
Afterwards, even if there is no view in HikaMarket ; it is possible to extends the HikaMarket front-end features via plugins.
For example, the MangoPay plugin or HikaSerial are adding new interfaces in HikaMarket that the vendor can access via their front-end dashboard.
So if it's something really urgent for you and you do have some development skills ; you can create your own interface to let the vendors have an interface to see the waitlist for theirproducts.
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.