Hi,
Thank you very much for the interest, and so sorry about the late reply!
I was hoping that I'd be able to work on cross-platform compatibility in the past few months, but unfortunately my schedule hasn't enabled me to do so. So for now I haven't been able to modify the external tools scripts to work with other platforms, and thus cannot provide any tips on using it with a Mac.
Therefore for platforms other than Windows my current recommendation is to perform these operations from the respective tools' own GUI, although I realize that this is not convenient. My apologies for the current limitations of this feature. Hopefully this may be updated by future work.
Best,
Greg