yes what you want is doable but is not available to the public its all a part of the feature encription all the radios out there by m/a com or com net and so on have the ability to do everythin just depends if its activated at the factory or not
2 im not sure on this but im sure there is a hefty charge for it
3 if youdont have a ver. of programmer than you can go through the on screen displays to find out whats in the radio (i dont have on here so i cant tell you the steps)
4 you can try
http://www.macom.com/ but i think the mdx had been discontinued