I'd have to agree with miramader. If you let yourself get use to it, controlling the fel will become much better. I was a little jerky with mine at first but as time went on, I learned how to feather it to do what I wanted. There are times now that I wish it had a faster cycle rate.
If you really want to the fel slowed down, either of J J's ideas will work for you. If height of the joystick wasn't a problem, you could extend the shaft making your hand movements provide less reaction on the valve and still have full speed when you wanted it. I'm just not sure how long the extension would have to be for it to comfortable for you.