This is because it is usually only one person at home who can use Litestep, while the rest of the family wants their Start Buttons. Well, with muLitestep, the only change that needs to be made is the directory in which the step.rc is stored. If it is unavailable, Explorer is started.
Details are in the readme.
Which means it will be a part of the official Litestep releases. Also, note that it does not have features found in newer builds of litestep.exe. Use at your own risk.