Just a thought / suggestion.
It would be better than the trigger guard had a combination of keys to turn up or turn down?
It is a bit ... wrong that every time you fire, it is lowered and raised. I remember that the KA50 has a similar trigger guards system that is placed in position by selecting the appropriate weapons.
It may seem a bit redundant, but if we already have cover switches and button cover up the landing gear, for another key more... and I think would be the most important of the 3 that I mentioned.
By the way, I was going to comment on the possibility of firing cannons and machine guns on different buttons, but I think it has been mentioned in other threads already.
Sorry for my bad english.