First off: Hello and welcome to The Burning Crusade Forums. I hope you enjoy your stay :)
As for your feedback: Thanks for taking the time to bring up these suggestions. I'll answer to them:
Nether Dragons are newer WoW content/lore. That's why in TBC (which takes place shortly after the events of TFT) Fel Orcs use Black Dragons as mounts.
About Vindicators: I wasn't actually aware that Vindicator is a name for a Draenai class in WoW. However, the term "Vindicator" is used for unit classes among Bloodelves and Dreanai alike. There are Draenai Vindicators and Sun Blade Vindicators (which are Bloodelves). Also, TBC Bloodelves already have Sun Seekers - a caster unit in the Sanctuary of the Sun.
If you come up with a decent name that can be used instead of Vindicator feel free to suggest one. My personal name ideas for this unit were: Vindicator, Avenger and Defender. Defender is already used by the Bloodelf Swordsmen though.
About AI: I actually don't know how to edit/add/trigger ai for custom races, that's why normal computers only utilize human/orc. If someone volunteers to help me I'll add ai support of course :)
Greetings
dArCReAvEr