I believe volley window is supposed to show heat generated per turn. In the attached save, with Adv. Weapon Cycler turned off, it shows me 100 heat per turn, whereas it should be 200/2,50, which is below 100. With Adv. Weapon Cycler turned on, the displayed heat generation per turn increases to 200, whereas it should be 200/1,88, which is slightly above 100.