I installed this mod few days ago and I'm having a lot of fun. It is a great mod with lots of fun additions, but one issue however has halted my progress. Millennium Battle done; after speaking with Arphaun, Lucious Aldin had only the basic dialogue like: Lucious is insane... and I couldn't get "The Wall" quest. Game reloaded, two different characters, two different PC's, all the same. Main quest not given means dead game.
However, removing the mod and installing 1.5b1, fixed the issue. Aldin gave me the quest for both characters. I reinstalled the 1.5b2, and all was fine, the quest was on.
If it is a bug, maybe it's not too hard to fix.