Yes starting ranges by default is sequel,
One an other forked Bitcrack today I see in my system, where generated random starting points, onword it's start from each generated point to series
Thinking if we load by file starting points, then maybe betterment,
By python we can assign single starting point for go on, but only when we need to search in trillions keys
And start/stop action waste time for small ranges for million etc

Not sure what you are exactly wanting, but the easiest way is to create a Python script to feed the program starting ranges, and to keep track of said starting ranges. Not sure if starting ranges = starting points, but that is what I would do.