I would like to know if a Research paper is possible for making a change in Open Source software tool I have been using this open-source network flow generator and after doing some research i was able to add a network classification engine based on ML into it, put it in other words i added a new feature into it.

So i would like to know if a research paper is possible for such work?
Impossible to know without further details. It might be, it might not. You might want to have a look at the Machine Learning Open Source Software track of the Journal of Machine Learning Research, accessible here: http://www.jmlr.org/mloss/