As mentioned above, it'd take away the full purpose of registration being closed in the first place.
Right now, it can come on at any hour and any day.
There wouldn't even be a point to have registrations open for timezones.
Right now, even if you're American, it can open in the morning.
Sometimes in the middle of the night and sometimes a rather normal hour.
I personally don't see why this subject is brought up more than once.
It's been stated that it's probably going to stay this way, at least for a long time, more than once.
One topic. (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=28682.0)
Another topic. (http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&topic=28073.0)
And then it's mentioned in pretty much every help thread that has been made about the registration.
I get how it can be frustrating, but it's the way it is.