Janskeet said:
See the problem I have is this isn't just an idea that sprung into his head. This was suspose to be the Emperor's master plan. So I think that instead of Vader seggesting the idea to the emperor, the emperor should suggest the idea to Vader, if you catch my drift.

Two things:

1) What's this "master plan" the Emperor is supposed to have? Based on the conversation, the way I see it , it looks as though Palpatine just wants Luke whacked so he no longer poses a threat. It's Vader who then comes up with the idea of turning Luke to the Dark Side -- reason being a) he's his son, and b) Vader sees Luke as a means to move up the corporate ladder and take Palpatine's job. The Emperor, for his part, agrees to this suggestion, either because a) he acknowledges that 3 bad guys are better than 2, or b) he knows what Vader is up to and wants to beat him at his own game (i.e., use Luke to get rid of the competition which Vader poses, which is exactly what he ends up doing in ROTJ).

2) Even if ady wanted to rework the dialogue as you suggested, how would you propose he do it? There exists no such footage with which to work. (I have this hilarious visual of snippets of Emperor dialogue cut and pasted together... I'm sure that would look convincing).