It's a nice thing to hope for, but
1. Most of the EULAs in the existing games say that GOG.com is in no way held responsible for modded content (because it's typically against the EULA), and if they made it part of the basic download, would then be held responsible for a third parties code, and in most instances it's not worth it to license the tools necessary to either decompile or read the files these third parties have created to ensure their 100% safety.
2. The Website itself here says that it is not responsible for third party content, just like the EULA.
So both the TOS and EULA are currently against that sort of thing.
But whatever I mean, anything's possible. The U.S. could have it's first Black President or first Female Vice President. How crazy is that, eh? To think that we'd see it at sometime in our lives..
Also, SEA BATTLE!