This "checkpoint system" was put in place to deal with the corrupt character issue players were having. In addition to that, if you duplicate, swap servers quickly, or play on multiple servers in a short amount of time, this may be why your character is stuck at that checkpoint.

Just to let you know, that issue is not a universal issue. Mine works fine. Please check your settings menu and make sure the invert setting isn't turned on.

Also, there are mods that so that you can have keys for cars to lock the doors and start them. It is on PC only though. Maybe one day it will be possible on Xbox.

Definitely not a bug.

Definitely one shot to the head. IT'S NOT A BUG.

That is a great idea in regards to starting the car but in reality, if someone wanted to steal your loot and didn't have a key, couldn't you just break the window IRL and open the doors? But hell yeah, starting the car with keys would be awesome but I'm positive this has already been looked at and didn't pan out.

And these are the people who give Xbox owners a bad name.