I'm not sure how feasible this is in Unreal Engine 4, but I'm curious to know if there are any long-term plans to implement in-game demo recording.

In 1.1, as I understand it this was accomplished by saving network packets into .DM_69 files that could be played back like an active network connection later.

It sounds like a trivial feature to have when you can screen capture with software like FRAPS, but it's actually a valuable tool for capturing evidence of rule violations so that warnings and bans can be issued - mainly because clients can be set to automatically record hundreds of hours of gameplay with very small disk space requirements.

I know this feature would have personally saved me a few major headaches in the past if I had learned to use it earlier, and I've managed to capture some rather unique moments with it in the time since I have enabled it that would have been lost otherwise.

Demo recording (client and server side) is planned and lately UE got update, where is this feature already prepared so it will be even easier to implement it. It is good for admins and even better when our bans will be almost unavoidable.