Hi Alex,
Before I get to the specifics, I should point out that the "release early, release often" model is still in play here. In other words I'll be adding stuff to NetTalk 5 on a regular basis, just like I did with NT4. So because stuff isn't in yet, doesn't mean it's gonna get excluded.
On the cookies front I've been experimenting with some different techniques. I'm not yet completely happy with any of them, so it's still on my list for now. But there will be something at some point.
On the style front I'll look into it - however when doing very fine style adjustments things can get browser dependent. So while it might be aligned in one browser it is then mis-aligned in another. So there are limits to how far that can go.
Cheers
Bruce