Played around a bit again today. Managed to clip into some new walls.

Can be used in Edge Fortress to go the flashlight door route again, and the outside in the rain before plains to avoid navigating the two invisible enemies. Saves some time on both of those.

For 5 finger white fountain runs it should save some time on the way down to the flashlight itself by using the way down shown in the video. And before plains like the other white fountain route.

No luck going through the wall before the fountains.

There are probably other places this can be used as well.