Cura Extrusion Multiplier

Does anyone know of a way to control the flow rate during a print? I've seen that there's a tweak at Z plugin and from what I've understood that's only usable for changing predetermined properties at predetermined layers of the print. What i'm wondering is if there's a way to change the flow rate as the print is already going like you can do in MatterControl with the extrusion multiplier.

Thank you in advance,
Nirel