More or less, yes. With the guns it's more of a hypothetical question. It's possible a gun could freeze then later unfreeze with the heater or lower temperatures, ect, I just figured, if you could set specific tank levels, I should ask about guns.
I'm trying to build a mission with specific and unequal quantities of fuel and ammo in the guns for the p51. From what I understand whenever you assign a fuel quantity it's always balanced between the main tanks and then to the back tank when they're full. I would like to specify the quantity in each tank rather than have it auto balance. Same with the guns, since each has it's own supply. Further, can drop tanks be set to have a specific quantity, rather than start full?