Hello. First of all, welcome to Modding Union
As for your help request, I cannot go very deep into the details of the game error, due also to my limited technical knowledge, but, as far as I know, the War of the Ring mode has always been quite buggy from the start. A very complicated matter to deal with, and you're not the first who encounters similar problems pertaining to the feature.
There are two major reasons for the actual (quite sorry) state of the said mode: the feature itself is hard-coded and therefore not so much modifiable to the fullest in all its extensions, and, adding to that, it's not really the priority of developers at the moment or a project which is worth spending more energy in than it is due. If you have already taken time to look at the official news statements, you've surely read that time is quite limited and the very internal team (and the Mod as a whole, naturally) have recently gone through very impacting changes. All the focus is now on finishing the two spellbooks left and eventually bringing the entire 4.5 overhaul to a satisfying conclusion. Paying further attention on the War of the Ring mode would mean even less time available and, trust me, with the pending tasks related to the 4.5 patch and the future Misty Mountains faction, there is still a lot of work to do.
Moreover, bear in mind that such game mode has never been something of the foremost importance from the beginning. Skirmishes do play a preponderant role in the game and, more so, multiplayer battles. I don't honestly know when or whether there will be other new things planned for War of the Ring games; though, considering the aforementioned problematics, one could probably foretell that it won't be in the very near future.
I hope I've clarified your doubts.