cannot aggregate multiple requests into a single export

[benclim]

Hi,
I am using Netexport with WebDriver and I am trying to record the network traffic for a page, but I have to log in first so I can take the data I am interested in.
In this case Netexport doesn't permit a time control for setting up when to generate the har file. It doesn't wait for a flow to be completed and than to generate the file.
Do you have any suggestions about this ? It's there a way to control it ?
Thank you,
Ben