Your username is nice.

I would love to see them make use of the entire right side of my screen.

Yeah, that's a lot of negative space.

I have never understood why the message space on this forum is about 400 pixels. Oh well, it's been this way for a long time and I've adapted.

I would also really like it if MKO were mobile/iTouch compatible.

As one of the crazed Kitana fans here, I'd love to see a Kitana theme. I think they could really make use of the colors and fabric texture from her current costume.

My instincts tell me it is in reference to a Slipknot song.

You're not the first to be making a thread like this, and you won't be the last. Believe me, there will be changes made to the site when the next version's ready to be released. It may not be in time for the new game, but it is being done.
We do have a Feedback Thread that most of those suggestions belong in, and have been mentioned as well, so it'd be best to post in there, though like I said, you're not the first to bring it up, won't be the last, and we know that the site layout needs an update, especially with all the empty space ans such.