This is extremely beta! Attempts to map out a virtual DDR pad on the ground:
Left click to define the upper edge and then left click twice to define the lower edge. The virtual pad will then be displayed with some poor perspective compensation. Right click to reset the pad if it looks wrong.
The sensitivity controls the deviation in pixel colour that is required before it is considered to have changed.
The steps are mapped to predefined keys: W=Up, A=Left, S=Down, D=Right
Tested on Win7 Pro 32 and 64bit CamDDR0.2