This is a borderline bug/feature request, please flip to FR if you think that's better. 

Google Chrome	72.0.3593.0 (Official Build) dev (64-bit)
Firmware Version	Google_Caroline.7820.384.0
and
Google Chrome	71.0.3572.0 (Official Build) dev (64-bit)
Google_Caroline.7820.384.0 

Steps:
# Launch ChromeVox with ctrl + alt + z
# Navigate to an HTML input type="range" (a slider), I used the "Bowling score" slider on http://chrome-accessibility.appspot.com/static/html5controls.html
# With focus in the slider, use right arrow keys to go from smallest to largest value
Expected: some way to speed up the ability to get to the top value. With the screen reader off, I can use search + right arrow to jump right to the top value. 
Actual: only way to get to top value is to hold the right arrow key for a long time or tap it 300 times.