I am using a wide screen (1080p) monitor myself and find that it is actually more comfortable to look at the content when its more centered instead of stretched for the full width of the screen.
Personally, I think its slightly easier to read this:
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Than this:
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This is an example with just one lines but if you are reading something much longer, you will find yourself having to move your eyes/neck much more frequently.
Anyway, this is just my personal preference but I don't think that it will be super difficult to create another style based on this one that will be of full width. All it will need is a new header image, some style modifications and probably a few more tweaks. This can be added to the To-Do list if more people are interested.
Thanks for your feedback!