I am glad you find my post helpful. Let me answer your questions to the best of my ability.
You are correct regarding the optional laser receiver/shifter, they are optional. The basic kit contains a radar receiver for X, K, Ka and on the Beltronics model, as opposed to the Escort Passport 9500ci, the same radar receiver housing receives laser but it doesn't shift/jam it. Behind the bumper cover the radar receiver for laser is useless as it needs a clear line of sight. I plan to install laser receiver/shifter in the near future. Look at the AntiLaser, Blinder and Laser Interceptor brands as they make highly reviewed systems. Escort makes an old ZR4 that directly connects to either the Escort or Beltronics interface and integrates with the system perfectly but it's not as good. I will choose the Laser ShifterPro upgrade for mine which apparently is made by Laser Interceptor and integrates perfectly with the Escort and Beltronics models.
I believe that radar jamming is illegal but it doesn't matter with certain systems such as the Beltronics STi-R Plus and sister product the Passport 9500ci as they are built to be undetectable by radar detector detectors used by police. They can also be update for future threats.
If you have ever used a radar detector and it constantly goes off when you drive by the same location the GPS feature will change your life. The GPS feature can show you your speed as you drive, locks out false signals after the 3rd time you drive by them, you can mark your own locations and it shows you where red light cameras are located. It makes the unit very quiet so when it does go off you can pretty much bet it's a real threat.
The display showing the location of a red light camera. As you approach the location it will show an arrow and distance to the red light camera.