Scrolling Bar Field (or you could call it a dragging bar)
Add a field with an horizontal bar with a circle that you can hold and drag It all along the bar.
I hope you're understanding what I mean...
It's not quite easy explaining withou imagens, but I'll try with this example:
The result would start as default. In this case It would be a bar from 1 to 10 (the user could be able to choose the interval), where you can drag the circle (witch you could be able to select its color).
Before dragging the circle:
..0
.🔺
|🔴——————————|
After dragging the circle, setting It to 8 from a 1 to 10 bar, for example (ignore the dots):
..........................8
........................🔺
|————————🔴——|
The number could appear diffetently as the way I've shown... but something like that with a nice or better design would be very well welcomed.