Non-Steam Mods (outside of the GoldSrc/Source Engine)
A lot of mods are completely separate from the game they were based on, requiring important game files to be modified (which can potentially block access to the original game without verifying game files, uninstalling the mod).

I propose adding a dedicated way to add non-Steam mods to your library, tying them to Steam games and giving them the same Steamworks data that the game itself does. That way, you can have non-Steam mods separate from their games without the mod potentially failing a "do you own the original game" check.
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This has promise...
There's already a system in place for making mods of non-Valve games and releasing them on Steam. Some examples:

https://steamhost.cn/app/2346660/DFHack__Dwarf_Fortress_Modding_Engine/
https://steamhost.cn/app/1281930/tModLoader/
https://steamhost.cn/app/365720/Skyrim_Script_Extender_SKSE/

If you are modding a game by replacing files directly, that's not something that interacts with Steam at all.

If you want to have both the modded and unmodded versions of the game installed at the same time or you want to avoid Steam updating the game and breaking your mod, make a copy of the game folder.

If you need the game to show up in Steam as if it's the game you originally downloaded through Steam and not a non-Steam game, make a steam_appid.txt file with the original game's appid from the store page URL in it.
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