Hi,

I think it would be a good idea to separate motion blur from other graphics settings (as it is, it's merged into post-processing). The reason: Post processing, for certain middle- and lower-end cards (perhaps especially in SLI) can cause micro-stuttering in games. I run dual geforce gtx 560s, and this is often an issue (especially with 3D Vision enabled). My PC is very high end, in all other respects ($600-dollar processor from a year ago, etc.)
But motion blur effectively doubles the frame-rate of a game (introducing a little input lag).