Vibration Conversion Mode feature request

[Ssssoar]

Should be simple to implement, but I'd love there to be an option for speed * position-> vibration intensity, rahter than just speed * length.
The logic being that in a stroking script, moving lots near the bottom is gonna be more intense than moving the same ammount near the top, so neither speed nor position on their own translate that very well to vibration.
It's a specific want I realize.