Best WFaS mod so far.
1 funny thing that happened to me is, that the polish commonwealth is basically split in two : Krakow + Thorn and Sebezh + Nevel (+Smolensk changing ownership every now and then).
The same happens to the Crimean Khanate too : Bucharest + Chisinau + Akkerman and Caffa + [the castle north-west of Azak] + [the slavers city on the peninsula]
also, there's an awkward slide of land attached to the crimean peninsula that is neither existent in the real world nor serves any function.
If you're still working on this mod, I got some suggestions for you : new things to trade with (furniture, non-functional artillery, ores, wood, ...), new villgaes / cities (Danzig, Åbo), new and / or faction bound mercenaries (swiss halberds, armenian / turkish / georgian archers, siberian pelt-hunters, crimean tartars)