1/ The only reason takeover is functioning without the key in the car is because you unlocked the vehicle. Permission to takeover comes from Unlocking from an authorized device; ie.. phone app, oem remote etc...
A thief cannot unlock the vehicle and once they break in, the car will shut down on door open. If a thief can unlock your car, that means he has your keys.
It's also important to note that on all push to start cars, once the vehicle is running, the key does not have to be present in the vehicle to drive away. Some manufactures will prevent shifting the car, but GM (at least my own buick), can be driven without the key present if it was already running.
2/ No answer for this as there are no reports of both glass and lift gate opening at the same. You can try changing options A2 to OFF and also changing A5 and/or A6.
may be i need to cut and reconnect C5 (brown wire) to Grey 26-Pin plug pin 23 (green wire) because its connected to 27-Pin Blue Connector pin 22 ?
It's the same databus. I don't believe this will change much.