Alan--Great to hear you're evaluating
DigitalPro. On the color & rating question, right now those two are linked, as much to avoid excessive confusion as anything, but you can certainly use any number of different keywords & keyword groups to further divide up your images. Is there a particular usage you have in mind for using colors & ratings separately?
Having a Map It button on either toolbar is certainly doable. Since it is something of an advanced feature for folks I suspect what we'd prefer to do is make it a menu command on the toolbar with a keyboard shortcut, and then anyone who wanted to put it on the toolbar itself could customize the toolbar to add it.
In the meantime if you click on the little "GPS" InfoIcon on the light table it will bring you right to the GPS/MapIt page of the image properties. Please holler with any other feedback or questions--David