mouse as the pointer is not straightforward

[dheinzerling]

It would be nice to make a couple improvements on the mouse as target interface:

1. Change the mouse icon to a cross-symbol (like Autocad) or cross-hair symbol when the mouse is over the active area to indicate that it is acting as the pointer
2. Allow user to click and freeze a point on the floor. Click somewhere on the color map--it puts a dot there and the results are fixed to that dot until the user clicks somewhere else. Or perhaps there is a stick figure in the model that the user moves around to get the results :)