Spitfire II quirks, questions and anomalies

[Das Attorney]

I mainly fly the Spitfire II offline. I haven't really been online as most of the servers I can find don't play it. That issue aside, during testing I found the following behaviour with the plane, and have a few questions.

1. Does Boost Cut Out work properly? I can switch Boost Cut Out on, with either mouse or via a key, but I can't switch it back off again. Presumably this is an oversight in the game. The Spit and Hurricane share the same engine and Boost Cut Out is switchable in both on and off settings using the Hurricane.
   
   
2. The Spit doesn't seem to overheat even running with Boost on. I can thrash it around the sky, with full throttle, 2600 RPM, Boost On and running rich indefinitely. As long as the radiator is partially open, the engine is fine. Fuel consumption is okay too. Surely this can't be right? I do run full CEM and temperature effects are on (as well as all other options set for realism).
   
   
3. Does convergence work properly? Before you answer, I'm aware that I should match up the target's wingspan and also 2 x the desired range to target on the distance ring (in the current iteration of the game). What I mean is, the tracers always seem to converge at exactly the same point in front of the Spitfire. One would expect that the point of convergence would visibly alter when moving the distance ring while holding down the trigger. It does not though (try it). Does this mean that no matter what you do with the gunsight controls, it will have no bearing on the actual point that all the .303's converge on? This leads me onto the next question....
   
   
4. How does the convergence settings in the 'Loadout' menu relate to the Spitfire? Again, I know that loadout doesn't work offline yet, but surely even if it did work, then it would be over-ridden as soon as you start messing with the gunsight controls in game. I thought one of the benefits of setting each gun up in the loadout was that the guns could be set for 'zonal convergence' as opposed to 'point convergence' (for example). Has anyone tried this online yet?
   
   
5. Lastly, setting the mixture to 'lean' always seems to make the Spit shake uncontrollably. I thought mixture was set for fuel efficiency when cruising, but even if the plane is trimmed true and at a good altitude (10000 feet plus for example), then it still rattles when the mixture is leaned out. Is this something I'm doing wrong?

Thanks for reading