If anyone is wanting to make a OS X version of the root flasher, just took a quick look at the
1.0.03.11140 OS X PRS-T1Updater.app (expand package) and it looks like they use the same .package format that is used in the Windows version of the minimal root set, and used the scripts are all "kinoma" XML scripts and plain text files for the UI.
Almost as if Sony is encouraging making "home brew" firmware easier by providing these tools without any real attempt to obfuscate their utilities?
Just wanted to point this out if you guys were not aware, but might already be known to community.