Force lightning question
So as we all know, the emperor has the ability to shoot lightning out of his hands, as does Count Dooku. Since we haven't seen the movie yet, I'm still unsure if Yoda has this ability or not, although we do see in episode 2, that he can at least absorb and redirect it with his hands. It is a very rare skill also, because Obi wan has never done it, and neither has Mace Windu or Luke in episode 6.
So why can't Darth Vader do it? You would think, that the chosen one, a former jedi, and a very powerful one under the training of Palpy, would have learned the skill. If dooku can do it, after being turned to the dark side for a much shorter time then Vader was, surely Vader would have also picked up on the skill at some point. So why can't he? And while i'm at it, Maul was trained from a very young age under Palpy, and was also very skilled. Why can't he do it? Dooku having the skill seems to confuse the issue.