There is not. It’s probably more about the exact setup you have, with amplitude of the motion not being enough to show meaningful differences between 1.1 and 1.15. Hard to say without fiddling with your project.
I made a test file using some 5x speed values:
On my computer, the actual movement of the boxes when scrolling does not appear to precisely follow the speed values set in the Vertical Motion panel. To me it looks like there is a threshold or rounding somewhere.
I stand corrected, thanks for the excellent sample. We’ll look into this.