You could do what Brogan suggested in to ways. Firstly you could set this permission for the individual user. Secondly you could set up a secondary user group with this permission and add the user to that.
I have the latter approach on my forums. I have a 'naughty step' group with Follow message moderation rules set to Never and various other permissions too. If anyone misbehaves it's then a simple step to add them to this group until they start behaving again.
I have the latter approach on my forums. I have a 'naughty step' group with Follow message moderation rules set to Never and various other permissions too. If anyone misbehaves it's then a simple step to add them to this group until they start behaving again.