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I believe we're talking about two separate issues, maybe this will help: http://en.wikipedia.org/wiki/Drain_Induced_Barrier_Lowering

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I don't think so. The effect of DIBL is an increase in leakage current with the drain to source voltage.

The first-order model I was taught in school was that leakage current not considering DIBL used to be proportional to exp(vgs-vt) but thanks to DIBL leakage is now proportional to exp(vgs - vt + eta*vds). The eta here is the DIBL coefficient, which AFAIK is 0.1 or thereabouts.

The first-order model falls apart as channel length decreases.

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