Will there be scope for adding mouse area to the QML Shapes Feature added in 5.10?  Or alternatively a helper item to identify if a point lies within a closed shape path, or line?

MouseArea only applies to the bounding box of the PathShape. In QGraphicsView, it was possible to use the 

QGraphicsPathItem::contains

in order to determine if a mouse pointer was within the created polygon. It is quite an essential feature, in order to add interactivity e.g. creating graphs,figures for scientific applications. 

Hopefully, something like this may be considerd in the future?