That sounds pretty fair, better then the way the sr3 rules handle it at any rate, I like it, kiss and all that. It also isn't open to the abuse that some interpretations of the rule is. Like one interpretation held that vision mag 3 automatically nocked the range down by 3 categories making all shots at the closerange difficulty, and with the smart link it made every single shot difficulty 2... ick
If the above rule is what you are going to use I can take off the range finder(Man and machine) accessory from my smartlink 2. It just was -1 at long range, and -2 at extreme. Effectively making it 2,3,3,5 at short through extreme range respectively.