Unfortunately, my snow leopard device is DOA right now, so I can't test it, but I think it should be as simple as plugging it in through USB when you have "PC Internet" chosen as your USB settings. I know it works instantly on Linux (without any drivers) and on windows with the drivers installed.
According to most references, a mac doesn't require any sort of "drivers" or kexts to get our phone compatible with it, so I would suggest just plugging it in and disabling your other connections to check
Samsung Captivate | Google Galaxy Nexus (GSM) | Google Nexus 7 (2012) | LG Optimus G (E970)
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