There sure is...just save the settings to either a hidden worksheet or a named constant (i.e. a named range that holds a constant, rather than a reference to an actual cell)
For example, on a workseet called 'Settings' set up a named range called "UserName" to say hold the user's name. Then you can refer to this in VBA like so:
IF [UserName] = "Jeff" then msgbox "Don't muck up my spreadsheet, Jeff!"
To set up a named constant for the above example, open NameManager, click "New", put UserName in the Name box and in the RefersTo box type "Jeff" WITHOUT an equals sign (and without the quotes)
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