Hi,
For your HikaMarket questions, the best is to use the HikaMarket secfion of the forum ; the HikaShop support team won't be able to reply you on HikaMarket.
And, yes, it is planned in HikaMarket to assign several categories in order to have more than the single "root category".
We tried to add that feature few month ago but we had some issues so we couldn't add it in the release. We hope that we will be able to fix that side effects soon.
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.