For all of you wondering what the last month or so of coding has meant for Mac Linux USB Loader, you are in luck! I am, as of now, officially releasing a consumer preview of version 1.1 of Mac Linux USB Loader! You can download it here on SourceForge.
Version 1.1 is mainly a small release with bug fixes, but there is one important new feature that I'm beta testing right now: the automatic USB device blesser. On OS X, a drive can be "blessed" to instruct the firmware to boot it - it can be on any drive at any path, and not just at /efi/boot/. Mac Linux USB Loader uses this feature of Macs in an important new way: it allows your Mac to automatically boot your USB stick whenever it is plugged in - no more holding down the Option key is required.
This feature remains optional and can be accessed via a new option called Modify Boot Settings on the main panel:
After you click the Modify Boot Settings option, the following sheet will pop down:
Just select your USB drive that has an installation of a Linux distribution created by Mac Linux USB Loader, press the Bless button, enter your administrator password, and viola! - when you restart your Mac with the USB stick in the drive, it'll boot up automatically into your installed Linux distribution. Of course, the Unbless button does the exact opposite.
* - Worst case scenario: your boot priorities are screwed up, in which case, just Option boot into OS X and from Terminal type (you'll need your root password, which by default should be your admin password):
sudo bless --mount / --setBoot