Ya this isn't a bug it has been in the previous ArmA games. play on expert and you wont have the "issue"

I also have been able to hit enemy vehicles with mines. You can't put a mine out in the middle of the road and expect it to be hidden. It would be unrealistic for AI to drive into a clearly visible mine when they could avoid it.

The vault could be implemented like they did in ACE, jogging and sprint have a faster vault move but it uses the slower default while walking. As for the climbing up sides of buildings I don't really think that it would be realistic for the soldiers to be scaling buildings with all their gear.