There crude workarounds for the weather problem. Not perfect, but reasonable. But for the wolfpacks there is no good substitute
because you only can replicate the massive attack and only in those convoys that have AI subs added to them. But not the whole hunt, shadowing, coordination from BDU, etc.
To me wolfpacks is the key feature missing in this game yet.
When, and if, the GWX4 guys manage to implement a similar AI sub as we have today (thanks to sergbuto) combined with SH4's ability to actually call the pack, we will have done a giant step forward.