Transparent QML/Qt view + clicking through to other applications?

[EStudley]

I'm trying to make an overlay for a video game I play using Qt/QML, but I would like to make my mouse clicks inside the application propagate through to the game behind the application.
I've been searching the forums and found multiple solutions to overlays including windows flags and setting the stylesheet to transparent, but none of these address the ability to click through the application. I tried my best with QML:

@import QtQuick 2.0
import QtQuick.Controls 1.1

ApplicationWindow {
id: screen
width: 500
height: 500
flags: Qt.FramelessWindowHint
color: "transparent"

MouseArea {
    anchors.fill: parent
    propagateComposedEvents: true
    onClicked: {
        mouse.accepted = false
    }
}

}@

Any ideas?