Hi.
I use KMA210 in my projects. Datasheet states max angle resolution as 0.04. So, on 180 degree range it gives you 4500 steps. If you plan to use DIY arduino based controller you can simply read output with good ADC and restrict output in software. If you plan to replace ordinary potentiometer in some joystick from the market you will probably need to program KMA210 to emulate full output on smaller angles. I have developed Arduino sketch for this purpose, but it is not stable and works from time to time.