Just running on simple engine settings, the Spitfire doesn't have Boost although I have seen it activate on autopilot. Same settings, the Hurricane boost worked fine, making it a better fighter than the Spitfire is. ???

Anyway, Boost never activates on simple engine management settings even with hotkey activation of "T" and "W" whereas the Hurricane does it automatically with no hotkey activation. I guess a fix is coming or is there a workaround?

Yes, the Spitfire had this boost but is not automatic. In the time pilots speak about of :"Breaking the wire","pulling the plug","Buster", "thought the gate" ,"Pressing emergency overide","press the emergency boot tit", etc, etc.
"Breaking the wire" refers to broken the protection wire in the throttle quadrant to limit the overpower and ev damage to the engine.

I'm pretty sure that the boost gate was closed off by a thin piece of wire. The pilot would move the throttle through the wire and break it to use emergency boost which might explain why it can't be 'closed'.