EarlyMon...use the TERMINAL app with unix codes?? YIKES!! LOL
Again, I'm thinking/typing out loud WITHOUT my Mac in front of me (pretty dangerous). Although I did the Astro method I described just before, I'm thinking the following....
Isn't it AS EASY as mounting the phone on the Mac...shows up on the desktop...open the SD card "drive" icon on the desktop...search for the ".nomedia" file...copy and paste where you need..."eject" the disk and disconnect the phone??
The ONLY issue I think we may run into is that the "." [period] in front of the file will make the file HIDDEN on the Mac so you have to enable the viewing if hidden files and folders, yes?? There are various free Mac programs that "allow" you to see the hidden files in folders (like those .DSstore files for folder settings)
I just think there's GOTTA be an easier way that that scary scary TERMINAL stuff!!
Hope this thought helps...I'm gonna try when I get home...if someone can confirm my thoughts PLEASE POST!