Originally Posted by stwert
Check the graph editor. That's where you'll be able to see the interpolation between the two keys, whether its linear, smoothed, or something weird like you're describing here. You'll also be able to adjust the tangents to correct the intermediate values. Hope that helps.
D'oh, why didn't I think of that? I'll try that when I get back to school either tomorrow or Thursday (Dunno if school is going to be out tomorrow due to snow)