Hello,
Regarding the addition of a tracking number while changing the order status, the complete feature require modification in the HikaShop core in order to support the "partial shipping".
CF :
www.hikashop.com/forum/20-market-feature...n-vendors-order.html
Partial shipping mean that, within one order, you can ship products in different packages which can have their own tracking number ; you don't have a limitation of one unique tracking number for the entire order.
It also mean that you can ship some products and later other.
And it allows HikaMarket to use the feature for the vendors, which could do the same and the "partial shipping" will affect the customer order without a potential "conflict" between 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.