Due to another bug, (easily fixed) I have found that simply taking the file named customSegments/customLevels and replacing the same named file in another file of DUGA, it will transfer over the segments. (Remember to copy your previous segment file in another location)
Here is my segments: https://drive.google.com/file/d/1I10Ez6NKWy-lhU545mpAcPjPxAjNNEo4/view?usp=shari...
Another idea: A backpack (like the one in the original DOOM) that increases the amount of ammo you can carry as well as giving you a small amount of ammo.