Hi Blaid,
Welcome to the Org,
to answer question 7. Check out the War of the ring thread (WoTR), or the Middle Earth forum. The modders involved in this project created Warg riders. Not sure if they created Wargs as seperate from there mounts or not but they might do for you.
As for 4, its possible. but you'd have to enter the coordinates where you want the 2nd sword to appear, for every image in every frame. 10-20 images per frame 12 frames in total. Look in Textures/Men/Items/Weapons and you'll get the idea.
5. To make slight alteration you'd either have to draw it into each new frame or make a new animation in 3ds max or whichever animation package your using. So no shortcut I know of
6. You can only retrain/repair units that you can build
8. Depends on your mod. If you want bodyguard units to be era specific, you need one entry per faction per era. Or they get shunted around. Apart from that I think you can pretty much do as you like in unit prod.
9. Is normal, if you change the starting date. I'm not sure if there's a way round it.
Good luck m8
~:wave