It's is already in the game believe. Just compare European provinces BT (Hansa, wtf?) and Russia's. So is the trade. Novgorod is basically useless trade node after Pdx removed demand-supply system. Fur sucks these days.
Novgorod is amazing, you just have to conquer eastward. You can steer all of Asia's trade back to Novgorod, though you will have to westernize to take advantage of trade companies. to properly utilize all those trade nodes.
Its just a pity that Novgorod's NIs are fairly mediocre... I am tempted to start a Novgorod game with the NIs switched out with Colonial NIs which are basically Novgorod NIs on steroids.