QDeclarativeSmootheredAnimation setVelocity does not update running animation

In QML, when the velocity of a running SmootheredAnimation is changed, nothing happens until animation is restarted.

I have a screen with a ListView, a slider and a play button. The use case is, I click "play" and auto-scrolling starts on the list. When the slider knob is moved, the auto-scroll speed should be changed on-the-fly. Nothing happens however until the animation is stopped and restarted.

By inspecting QDeclarativeSmootheredAnimation::setVelocity() I realize that method only changes the velocity of the "template" animation, and not of the actual running animation.