So here is a list of lines with potential utility from the Star Wars Interactive Video Board Game; every line is Vader's:
Unleash your anger. It brings you closer to the Dark Side.
The power of the Dark Side will destroy you and your Rebellion.
There are no excuses, Commander.
You respond well to the Dark Side.
Answer!
You are truly evil.
My control over you will soon be complete.
Only a true Jedi can control the Force
Do you not realize that I am controlling you?
The responsibility is yours, Commander, and you know the price of failure.
But I doubt they will help you, nor will your Rebel friends.
Report, Admiral?
I shall make you my pupil.
You shall forget all you've ever known and loved.
They shall be nothing to you.
You shall be mine.
When I call, you shall reply, 'Yes, my master.'
You shall obey me completely.
I am displeased that you failed to apprehend the Rebels.
Address me as Lord Vader!
I see the Force is with you.
Commander, you have failed me for the last time.
The Force is with these Rebels.
But I am master of the Dark Side.
I see a great confrontation with Skywalker.
I shall make him bow to the Dark Side.
Some of these line are hokey. Trying to see how to work some of these in, it crosses my mind that we had voted to strengthen Vader. I'm not sure how we would include these lines, but some of them could be used to indicate that Vader is trying to pull Luke's strings. It makes him seem to take more of the initiative on such things, and might make the tension between Vader's and Palpatine's desire for Luke as the new pupil more interesting. On the other hand, if Vader seems too strong in the face of his Master, it detracts from the significance of his overcoming Palpatine's grasp when saving his son and throwing the Emperor overboard. Potential places include conversations with the Emperor (especially when the Emperor is looking out the window in the throne room, where he can be dubbed to match changed Vader lines), when talking with Luke on the Endor platform, prior to the duel in the throne room, or even during the duel. Also we can possibly make him snap at some subordinates. And of course, maybe we'll use nothing, but this does give us a little more leeway with how to move the story. One other drawback is that James Earl Jones didn't make Vader speak as powerfully in this game, sounding a little too nice at times.
Shots that may be useful include Vader staring out a viewport, walking down a corridor alone, and walking accompanied by stormtroopers. The most useful to me would seem to be his walking down the corridor alone, as there are two places I would find this useful, but we only have one shot of it. He walks down a hall to the turboshaft as he heads to his meditation chamber to call out to Luke, but he also approaches Jerjerrod when he wants to see the Emperor and Jerjerrod tells him he may not enter. The second doesn't show a corridor stroll. What I think could be useful is to use the first deleted scene's walk as Vader approaches Jerjerrod, and use the walk from the game for when he approaches the turboshaft.
