Utilizing something makes something else be non-automatic. That's number one.
Number two. By "using" the cannon, I take you mean by firing it? I didn't say that it was impossible to flip the Mako, I said it was damn near impossible. Firing the cannon would generate the thrust needed to get you back at least on your side. But then again, these guys are in the games industry. Not NASA or its equivalents. It had something to do with the weight of the wheels and there being only six of them, not eight, not 12. Six wheels. Something about how the physics would allow it to roll a side and be able to right itself eventually. The same was true of the Mako.
Number three. I certainly hope so.
What? You don't know what you're talking about.
You drive the Mako up a mountain, it tumbles down and lands on its roof. Then, with you not even having the hands on the controls, it will move its cannon around to get the necessary leverage to get back on its wheels again. Automatically. It doesn't fire. Why would it do that?
This happened a lot, so I don't know where you got your "next to impossible" from.
The wonky vehicle physics in ME1 are in no way an indicator if 6 wheels are better or worse than any other numbers of wheels.