Dynamic Crosshair/Exact Aiming

I'm currently doing a FPS, and when I came to the weapons I had some thoughts about gameplay elements related to these;
So I'm interested in hearing your opinion:

In most current shooter games, the crosshair is kind of scaling while moving so it looses accuracy. Do you think that this is necessary for a good shooter?
And the second thing, in nearly all FPS you can press the right mouse key and the weapon gets to the middle of the screen so the player can aim over it instead of the crosshair. What do you think about that?
I'm asking all these questions because I'd like to do a more old-school thing... well, not THAT old-school, more like these games that are called "old-school" because they don't have a cover system or weapon tuning (like Unreal2 or Quake4 or Legendary or...).
However, I do not think that these things are typical for an old-school shooter, but I just want to have more opinions about that.

you can do your fps as you like. the main spect is the realism of your game. the "old-school" shooters are not quite realistic. so you just have your cross-hair staying in its size and a given accuracy. the older shooters have the princip to just shoot everything that comes into your way! i like that style! :-D
soldier of fortune I, quake 2, unreal I were quite nice games where you can fetch some ideas. good luck

Thanks. I think I'll probably stay with the scaling crosshair, but I'll do this as a optional function .
More opinions are welcome!!!!

not optional. "maybe" as an extra difficulty level, but either it is like that in a game or it is not. it's like that aiming aid in ut: senseless and you're cheating yourself.

If you implement the right mouse option, maybe you should also change the camera position to provide a slight "zooming" affect.

That's true... Anyway, I will stay with the scaling thing, like I said. It's already coded, so I'm not going to delete this...

good. giving the user too much flexibility can ruin a game as well.