Thanks for the feedback on the sounds. I've not installed 1.151 yet but it seems there might be some bad issues like the ones MV is mentioning, especially the ranged troops not shooting would be bad. Also the hit boxes seem to have been modified (the have been narrowed down for objects such as trees, so if you hit a tree a bit from its center, then the arrow will go through it).
By the way, the new crouching feature that can be enabled in the ini file: will it be used by the AI automatically? It would be nice to have wall defenders in sieges be able to crouch, but at the same time it might unbalance existing sieges and make them harder for the player.
@MV: You're right, I'll take a look at the 1.151 module system in the weekend and see what would be beneficial to port. If there are incompatibilities then those would need to be fixed as well.