1. If they intend to fit 26 episodes into a movie, a lot will have to be cut, but I doubt it'll just be 3 hours of Angel killing. Perhaps they'll show a few fights, and skip the rest in order to deal w/character developement and whatnot. This type of thing has been done many times for anime movies (ever seen Death & Rebirth?). It won't be any different just because it's live action.
2. I don't know which English dub you've seen on DVD, but the one they showed on Evangelion is the only one in existence. I suggest you listen to it again. It's the exact same cast.
3. Misato's VA fits her perfectly IMO (and is one of my favorite voice actresses). Ritsuko sounds like a mature woman, and is one of the better actors in the dub - I don't see how you think she sounds 16. Fuyutsuki doesn't sound 50, but I still think his voice fits him.
Edit: @Aramis: He meant Fuyutsuki, not Gendo