Both points are well seen. BUT EU is a part of the Star Wars UNIVERSE and so are the movies. BUT the movies are NOT the Star Wars Universe, they are a part of the whole.
15 hours of Movie do not constitue the whole. Some are happy with just the movies. Others want to go deeper, that's what the EU is for...
BTW, why has this thread got an almost twin in the Ep2&3 forum?
Actually, Darth Maul was originally penned in as using two sabres. But none of that stuff is really so unique as to constitute official book-to-movie status- it's all based on much older ideas, anyhow.
And Force Speed is hardly a massive leap of imagination, is it? It would be one of the first powers I would have thought up, Jedi Knight or no Jedi Knight.
Factually speaking, EU sources do not count for the 'true' Star Wars continuity.
However, as I have said in the Episode II and III topic, I am officially conceeding this argument so as not to offend the EU lovers any more. It's just not worth it.