I intentionally wiped out the lightmaps to make the example shot look even shittier. :p And I just realized I should have posted this in the UDK subsection. Oops!
Not sure this has been covered or not, but it's possible to mask off UV spaces with nodes in UDK instead of bringing in the additional texture sampler with the checker pattern. If you place your flipped UV's to the right of 0-1 space for example: http://i.imgur.com/JwPce5R.jpg For other UV layout situations one could…