hello lsa,
Actually I am asking the same question, and I couldent find any answer, did find any trik to do that, I geuss they should update the toolbox to be able to use two inputs in the same time.
we may can help each other in this, feel free to contact me if you want
here my email:
ihssane.houhou@univ-biskra.dz or ihssanehouhou@gmail.com.
best regards