So far so good. I went back to a couple of locations where I've seen the flash with some regularity, and I haven't been able to reporoduce it yet. But it's always been sporadic, so I'll have to see how it plays out over time. But hiding that smelter file seems to have worked so far. And while I suppose I could tell the difference between the vanilla and SMIM versions if you somehow put them side by side, I don't see any real practical downside to hiding that file in terms of actual gameplay.