I proudly present you my first own created plug for Kerbal Space Programm.
The Flight Manager for Reusable Stages X1.1.00.01!
FMRS lets you jump back and forth in time.
It generates save points after separating controllable probes, ship, landers, ...
So you can launch your mission into space, then jump back in time to the separation and have full control over your dropped vessels.
You can do SpaceXÃ‚Â´s Falcon 9 style launches and fly your first stage back to the launch