Allow rewinding back to a frame that was previously part of a resimulation. If a resimulation is performed between frame 100-110, allow a new resim from 105-115 if needed, else next resim will be able to start from frame 111.
Usage
p.Resim.AllowRewindToResimulatedFrames [value]
Set via the console (~) or in DefaultEngine.ini / DefaultGame.ini.