Like those before me have said, it all requires a 'module' system to be ported for this particular version of Mount&Blade, this is the same tool that the developers used to make all the content of this game.. This is because the content that makes up the game are python read as text. This makes it hard for us humans to read. As such, Modders are waiting for this tool that holds all the variables and such for the game. Now, you may be wondering why if the original developers had this tool, why don't they just release it; well the original WFaS was for the original M&B engine, and it was just ported to this engine (Variant of the M&B engine). As such, features are missing, and as there is no module editing tool for this variant of the engine (or the additions I bet will be added soon, meaning they can't exactly 'finish' it). This might make you feel ripped off, but it shouldn't your money was well spent, as they are supporting this product even after release; and not just fixes, but entirely new features will be added to M&BWFaS. Anywho yeah...I suck at writing concluding sentences.
Disclaimer: The above text may be COMPLETELY wrong, its just what I have gathered from my brain after reading these forums (but staying silent), for a couple of years
