I realized that the game is just a .swf file that has been converted to .exe, this can be undone and the .swf using any (usually paid) .swf to .fla tool would allow you to modify the basics of the game increasing the ability to mod the game to have anything you desire allowing modding further than just the .xml edits.
Here's the tool I used to convert the .exe to a .swf; it will give you 7 files, NeoScav is "NEOScavenger.swf":
The other 6 files are just support, using a .swf player you can still play Neoscav using NEOScavenger.swf as long as all the other files NeoScav requires is in the folder. If you want to re-compile the game you can use this tool to convert swf to exe:
When it comes to converting it from .swf to .fla you'll need to find a tool for it as most are paid but if you're willing to pay for it; here's a tool I've used in the past. I'm not sure if it works for NeoScav but I'm sure if you try multiple tools eventually one will work perfectly if not this one: