custom time range is somewhat inconcistent. if i set the timeline length the simulation will stop even if the custom length goes further. and if i set the custom length but the timeline is shorter it will stop. i think it would make sense if the custom time range would rule over the timeline.
It seems in both cases you mean the same thing: if you set the time range larger than active time line you want it to use the time range instead of active time line? Why is it a problem to set the active timeline to match your time range?