Well, this seems pretty stable. Only real issue is you CAN NOT do Kano's decap projectile against Goro or Shang Tsung or it will crash the game. There are no sprites for a headless Goro or Shang Tsung, so the CPU doesn't know what to do and just resets the game. Otehrwise, I haven't found any real problems.
When I get home from Afghanistan I am going to burn these hacks on actual roms and test them on the real hardware. I'll report back then. Stay tuned.