Geoffrey_Coram
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You should really be asking IBM's foundry support directly, not posting here on a public forum. I don't work for IBM, but I have used BSIM4 a fair amount.
I will note that, while vth0 has a linear tempco as seen in equation (13.1) of BSIM470_Manual.pdf (the latest I have), with KT1, KT1L, KT2 multiplying (T/Tnom-1), there are other terms in Chapter 2 that could have temperature dependence. T appears in the non-uniform vertical doping, the pocket implant, and short-channel equations. The complete Vth model is shown in (2.40).
Further, I think the pocket implant could affect gds, as a result of DITS (drain-induced threshold shift).
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