While watching Ryemanni play through LP3D in Loap, he ran into a case where in an enclosed level he moved a camera into a tunnel created by a basher, then rewound gameplay. The result was that this camera was stuck in the tunnel, which caused issues that I can't go into detail without spoiling the level.
Loap does have a means of moving the camera through walls, but this may feel a bit cheaty for some players. A way to reset the cameras to their original positions seems worthwhile.
Important context: Much like how NL doesn't treat the scrolling as part of the replay, Loap doesn't treat camera movements as part of it, so rewinding does not undo camera movement.
Implemented in commit cf8786f.
You can now press Ctrl-Tab to reset the current camera to its default position. It will fail if the current camera does not have a default position (due to being an extra camera created by the user during gameplay). You can also right-click the camera icon on the sidebar to achieve the same.
Since it made sense to do this while adding right-click support to the sidebar, you can also now right-click the RR increase / decrease buttons to instantly set the RR to max / min respectively.