Hi
I've attached a script that moves the camera when you click and drag the mouse. It's not exactly what you need but it should be close. Add it to your project and to your scene scripts.
If you want to do this when clicking the terrain only (as opposed to clicking anywhere), then replace the mouse events (such as wade.app.onMouseDown) with the iso terrain events (e.g. wade.app.onIsoTerrainMouseDown).
Also that script works with the right mouse button. If you need another button then change the button number in the script (I think it's 1 == left, 2 == right, 3 == middle)