I'm aware it has been reachable by console.
Sorry if I was unclear: In the last month, there was a Steam beta update that re-assigned AutoExposureMode 2 to the same rendering mode as AutoExposureMode 1 - there was no difference anymore. I always liked the way 2 worked. Even though it wasn't properly calibrated yet, it had a way of making things more photographic, so I used it a lot for screenshots - usually necessitating tweaking nightside lights, star overbright, or exposure to make up for its rough edges.
The last time I tried it, it was working again, more-or-less as ExpMode 2 used to, rather than the carbon copy of 1 that it had become.