Build Modifier: Sequential mode :number of strokes

my hope is to be able to specify how many stroke going to be builded at the same time like 3 strokes then the next 3 strokes to the end * also an option for incrementaion(1 stroke -> 2 strokes -> 3strokes ..... final strokes ) and decrementaion these options may be added in the other modes like concurrent mode.

or a new mode with other options like rondom number of strokes will be builded every time to the end with a maximum and minimum