Hrm... I'll have to play with it more I guess... see if I can make it work for me w/o it being too frustrating.
FWIW, having to do this kind of manual curve adjustment for every new keyframe really slows down my workflow.
Any chance you could automatically make the curve smooth into each other like Unity's "Auto" keyframe curve setting? It's not perfect, but it really does get you to a good base that you can tweak easily. Rather than having to tweak as you go. Just a thot.
Cheers!