Add more controls Slider/Rotary

I wanted to test build robotic arms like in space shuttle, and it appeared to me that 2sliders are not anough for complex machinery.

We will need (and that you will be even more true when some skilled crafters will come) at least a third slider + some kind of rotary tool which can be modified to some degrees up to 360.

Or better a kind of joystick UI, moveable with mouse