im going to heat treat my shift shaft in my oven- you guys can make one from rare earth metal if you want.
 
a recipe i found for small steel parts for diy heat treating is 4 hours at 450f with the part wrapped in fiberglass to protect it from the heater elements.   perhaps longer due to the thickness.

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will that do for the shift shaft?

450 F for 4 hours is going to change the temper only if it is high carbon steel.  If it is high carbon steel and was already heat treated so that it was hard and very resistant to bending, your temperting process for 4 hours at 450 is only going to make it softer and bend more easily.