It shouldn't be shift- or ctrl- anything. It's not useful to have a code that requires you to press two keys at once when many in the potential user group are not able to do that.
The standard code 5*NumLock and 5*Shift for sticky keys. This is not a sequence you would ever have any reason to press under other circumstances. Ideally this possibility should even be available at the GDM.
It shouldn't be shift- or ctrl- anything. It's not useful to have a code that requires you to press two keys at once when many in the potential user group are not able to do that.
The standard code 5*NumLock and 5*Shift for sticky keys. This is not a sequence you would ever have any reason to press under other circumstances. Ideally this possibility should even be available at the GDM.