Q to Win re:oscillation in high-voltage MOSFETS

I have tried the models for the FQD2N100TM FET and have some questions.
1) The log(Is) vs Vgs relationship does not hold below about 1mA, and i need that to work to at least 1uA; preferably to 10nA.
2) I see nonlinear *gate current*: 10uA at 0V, 0uA at 50V with "knees" near 5V and 9V. I had the mistaken impression that gates were insulated from the channel, and that there were no batteries inside FETs.
3) Could you please provide a resistive SPICE single-FET circuit that might oscillate?
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