Ah, got it. Yeah I wouldn't be too keen on anything breaking my game either, and I could not promise that whatever comes from this would not do the same--it's just the way about the nature of the game being so old and mods that use a custom API in general. That said, I don't plan on really changing anything about the game myself-only to abstract the assembly instructions that only the machine can read, which really just means: make the source code readable and accessible. In my case, just some of the source code; not all of it, as you'd have to be a mad genius to make sense of it all. Once an early version is out and people want to play with it, I would encourage anyone to make a backup of the exe file anyway.
The Venn diagram of programmers and artists in the ZT1 modding scene at the moment seems to lean heavily in-favor of the artists so it may just be myself that gets a kick out of my API, so it might not be a problem in the end.