There is a kind of workaround.
Firstly, the camera REC flashes when there's less than 5 mins of record time left.
You can also calculate how much remaining record time there is on a given SSD if you know the record time for a full disk. For example, I know a 240GB SSD gives me close to 30 mins @ 25 FPS.
When you play back the last clip recorded, the TC field at the bottom displays the total record time. This way, let's say it's 00:22:03:00 i know i have about 7 mins of record time left.
They won't do in camera file management. They might do an in-camera format....maybe...
Alexa's don't allow you to delete individual clips, nor do RED....
jb