In FSX you can change the control mode to a linear fashion by editing the .CFG file (Google it). Then you can use the sensitivity sliders to reduce the range of motion. A better option is to use a payware add-on program called FSUIPC (Google it), which will allow you to edit the controls more precisely.
Frankly you won't ever get it to feel realistic, but it might be sufficient for your purposes. If you are just practicing procedures it might be easier and cheaper to just use the mouse and keyboard.