Shift Key Suite for Mac

From Marc Mennigmann:

The Shift Key Suite is a powerful collection of applications to extend the functionality of most of the password protection systems for Macintosh computers. But : "Why Do I Want To Disable The Shift Key?" Holding down the Shift key when launching your Macintosh will prevent all extensions to load at start-up.. This is an interesting feature when you have start-up crashes from incompatible extensions and controlpanels. However, if your system is running smooth, you may want to protect your computer with a password protection or a similar application/extension. Most password protections for the Mac are extensions or controlpanels. Therefore you can simply bypass them when holding down the Shift key at start-up. This is where the "SKS" comes in. It gives you the option to disable the Shift key only for the start-up time. After your Mac booted, the Shift key works as it always worked when you worked with your Mac.