UDK Motion Blur + DOF

Hey guys, I am setting up some post process effects and I have a bit of an issue. I'm not too sure what settings are good when setting up the motion blur controls, to be honest I'm not sure what they even do. Could someone lighten me on what these settings actually control?

http://gyazo.com/4c1e1b12f95340ee9b5b7eb6edaab795.png

Much help would be appreciated. As with the Depth-of-field, I only want to set it up so only the character focuses on items, depending on where he is looking. If I cannot do this, having it on the distance focus type is just as good, although because my map is outside, I don't want my sky dome to be effected by the motion blur. Is it possible to turn it off for certain meshes?

Much help would be appreciated, thanks.

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