We can't force settings. Must be a issue on your side, maybe check if High Quality Resize mode is on, try using None instead of None (Nearest Mipmap) or changing your render API if GZDoom.
The effect only seems to happen in one specific spot in E1M1. Changing to None didn't affect it, the High Quality Resize stuff is turned off, and it happens under both Vulkan and OpenGL (I'm using GZDoom). I think it might just be an engine quirk since it didn't feel like a global always happening thing. I wasn't even sure about calling it motion blur, it was a weird kind of ghosting that would happen when turning the camera horizontally while looking at a specific wall. I think it might just be more of an optical illusion thing if not just an engine quirk. Definitely not caused by your mod though, yeah. Thanks for the info.
As a separate question that I might as well also check, but, are enemies supposed to just make 8-bit noises? They don't seem to be voiced like Daisy is, and I just wanted to make sure that was by design and not some sound setting I have to adjust.