Hello,
a - When you're using HikaMarket to "pay" the vendor in the backend, the paid orders are extracted from the "balance". So it's already working like that.
1 - There is already the block "orders unpaid" in the front-end vendor dashboard.
2 - There are already some statistics about that in the front-end vendor dashboard.
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.