Found an interesting side effect. I was traveling through the dover straight and was just about past all the DD's when my periscope got spotted. I don't recall if the planes had been in the area already but they joined in on the attack. There was around 6-8 planes total and 5 DD's total. Sure I wasn't anywhere near the spot they were attacking but interesting all the same.
I need to work on the plane AI because they will just attack where a sub was last spotted until they run out of fuel.
edit - also DD's will come if their close enough when you get spotted by a plane.. this mod really makes the straights of dover as dangerous as it should be