[QGIS-Developer] adding vertices to digitize session via python

[Jonas]

Hi,

is there a way to add vertices to the rubberband when the user currently 
digitizes a feature via the python API?

For example when adding a line feature, the user has already created a 
few vertices of a line via the rubber band. now i want to add the next 
vertex of that rubber band via python. I do NOT want to end the users 
action to create the feature, or add vertices to already existing features.

I think that would mean calling addVertex() on a 
QgsMapToolCapture-object. However i cannot find a way to retrieve a 
QgsMapToolCapture-object from the current mapTool.

Is there a way to do this?

Thanks

Jonas