It isn't a way to dynamically set your viewport, but with some know-how, I am sure our resident gurus could come up with an editor input box that would allow you to set it...
If you look in UIBuilder, under MainHUD, the LetterBoxFrame is defined there. The left and right sides would be added, and with some really nice know-how, someone could make a custom window that lets you enable or disable individual sides of the letterbox, and change their width...
It isn't hard, if you use the OnXXX events of different controls to change values in other parts of the UI. I may play with it and see what I can do. It isn't something I personally need as I am happy with the default letterbox setup, but I CAN see the benefits to some people of having differing sizes.
I obviously haven't tested this theory in-game yet, so I don't know if any of the targetting issues would be present, but I highly doubt it...
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