Thank you for your input.
Unfortunately our original KC-130 model does not have any inflight refueling capabilities except some visuals. It's not marketed as multiplayer game neither. So infact there is nothing to fix.

another company included some third-party inflight refueling module in the box, for obvious reasons we can not provide any tech support for that, so please contact another company directly.

Good news: Next generation of the C-130 family of products (C-130 Captain) will deliver a number of interesting features, hopefully including the air refueling and MP.