Since Mach4 was based off of a Fanuc 21i controller (I think 21i) I looked up fanuc look ahead stuff.
I found this forum post:
https://www.practicalmachinist.com/vb/cnc-machining/5043-look-ahead-288314/It says to put a line with G53 before the moves that need to be essentially 1 line look ahead. They called it "buffering" in this forum post.
G53 is machine coordinate move so I was confused reading it, but the post explained G53 on a line by itself apparently prevents this "buffering".
I did load up Mach4 on my laptop at home and made a simple program that I put G53 in between each individual move. It didn't give me an error for reading just G53.
Not sure if it will work, but hey, give it a shot.
Still, I like the way haas does their look ahead inhibit. G103 or a "/". Hopefully someone from Artsoft will jump on here and tell us for sure what to do, or implement something similar to the Haas or find how fanuc actually does it to keep with the fanuc type controller.