Greebo, from a gameplay standpoint I agree. From a technical standpoint, there was nothing stopping them from staying on the wings other than the weight and drag penalties. In reality they were taking off from rougher, shorter fields than we have in-game. So while WE have the runway length to build our speed with the additional drag/weight, they might not have had the option and HAD to use them or else hit the trees.
However, it was up to the pilot to trigger them.
In terms of gameplay and compromise for the greater good, I would suggest possibly making them automatically fire as soon as you hit 50mph airspeed. However, please note this WOULD be an arbitrary decision and not a historical limitation.
I think we also need to remove those tailguns ASAP. Total work of fiction and fantasy. Might as well put 20mms on P-40s. Adding a forward firing 2x20mm ventral gunpod would be icing on the cake.