I assume the firing rate you spoke of is the "Homing Factor 72"? I also saw the "Sword Beam Defense Off". Btw when I opened your example quest, ZQuest told me that the quest was edited on a higher version of the program. However, I have 2.55 which I thought was the latest version?
Nah, his firing rate is actually hardcoded. A lot of stuff with NES bosses is. The enemy editor stats just affect his movement, if that.
The example quest I posted was saved in a nightly build which aren't updated on ZeldaClassic.com. You can find the newest builds on the Official ZC Development Discord sever:
Otherwise the next numbered alpha release should be compatible whenever that is.