I personally would not try to make a DDS file that is not square and a power of two. I can at least think of a reason for the power of two part. You can't make mipmap levels for the textures without doing so.
2^0 = 1
2^1 = 2
2^2 = 4
2^3 = 8
2^4 = 16
2^5 = 32
2^6 = 64
2^7 = 128
2^8 = 256
2^9 = 512
2^10 = 1024
2^11 = 2048
2^12 = 4096
2^13 = 8192
2^14 = 16384
With 1280, at your 9th mipmap level, you'll have fractional pixels, which is impossible. Also the higher you go, the less likely the video card will support the texture size.
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