Stamp wad name on saved games, is this possible?

[invictius]

I'm guessing it's not, since it's something that would be extremely useful. I have no idea which wad some of my manual and autosaves from the past needed.

[_mental_]

Try to load a saved game and GZDoom tells you what's missing. This works only if a map was from PWAD.

Batch processing is possible too because saved game is just a zip archive with thumbnail and a few .json files in it.
Parse info.json file which contains "Game WAD" and "Map WAD" keys.