Adjust translation speed of QML DragHandler

[laseranimation]

My question is about using a QML DragHandler to move a QML Item. I have successfully implemented position through dragging (when holding the Ctrl modifier) like so:

DragHandler {
    dragThreshold: 0
    acceptedModifiers: Qt.ControlModifier
}

Now I would like to add another handler that allows me to precisely position the element. Other software does this throught the use of the shift modifier. So what I want to do is move the element not by the pixel amount that the mouse moves, but an amount smaller than that. Ideally I would want to do something like this:

DragHandler {
    dragThreshold: 0
    acceptedModifiers: Qt.ShiftModifier

    onActiveTranslationChanged: {
        activeTranslation *= 0.5;
    }
}

Unfortunatelly activeTranslation is read-only and I don't see any other property I could use and I can't think of any other way to do it... Does anybody have an idea how to acchive this?

Thank you very much in advance!