A workaround:
1. Cut the scene that you want to "rewind". "Copy and paste the scene to the end of the "forward" scene.("paste, insert and move all clips")
2. Reverse the scene.
3. Produce the range of the just reverted scene. It is automatically added to the media library.
4. Drag it to the exact position of the reversed scene. It fits exactly. Choose "overwrite"
5 The reversed scene is a normal video now and the speed can be changed.
Good luck!
Hatti
Win 10 64, i7-4790k, 32GB Ram, 256 GB SSD, SATA 2TB, SATA 4TB, NVidia GTX1080 8GB, LG 34" 4K Wide, AOC 24" 1080