Hello,
1 - The copy of product is just allowed for the main vendor.
Allowing vendors to copy products would be problematic since they could have access to information they should not.
2 - That's something we talked with the HikaShop team.
With order which can have multiple shipping method (using warehouses), you can have "partial shipping" and notify the customer regarding its order update and the "partial shipping".
HikaMarket vendors just have access to their part of the order and don't see the rest. The "partial shipping" is not visible for the customer and something, he won't even know the existence of the vendors.
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.