Okay, I used this function on the forums called "Search" and it yielded fruitful results.
Just for future reference:
-To save during Tough Guy mode. Use the FOT Editor that is in the FOT directory(installed along with patch 1.27).
-You won't find all of the mission files to edit, only the patched files, therefore you must unpack the .bos files that contain the mission files.
-Those files are named: mis-core_A.bos, mis-core_B.bos, etc.
-Change the file type to .rar or .zip for whichever of those programs you use.
-Then extract the files to that directory and they should filter into the campaigns folder and subfolders.
-Now open the FOT editor which should be in the main directory along with BOS.exe
-Select Level editing and begin opening all of those .mis files that you extracted into the campaigns/missions/core folder.
-Open one at a time and once loaded press F7. Then on the left hand side of the screen there will appear a menu. Click on "Is Bunker" so that a check mark appears there.
-Now you can save during missions, but not on the world map.
-Enjoy double xp and not having to start over due to crashes.