You need to create and set a database property AllowBypassKey.
Check
http://www.mvps.org/access/general/gen0040.htm for the correct way to
create this property.
Once you've copied MichKa's code into a module, you can call it as
ChangePropertyDdl "AllowBypassKey", dbBoolean, False, True
Note that this won't take effect until the next time you open the database.
Note, too, that you don't need to save the module containing MichKa's code:
once you've set the property, you shouldn't need that code in that database
again.
Do this on a copy of your database, just in case you have occasion to use
the Shift key yourself someday!