If you only use Mach3 and Dolphin I would just change the IJ Mode setting in Mach3. Even if you use other CAM packages it is very easy to change the IJ Mode in Mach3 and if needed you can change it back just as quick for a different software. The setting has only 2 choices Abs(absolute) or Inc(incremental) and is easy to change with a radio button selection. I believe you will find it under the Config tab, general config. if I remember correctly.