The option to ban IP addresses in ZenDesk Support (not Chat)

Hi, I came to a situation where an end-user is "stalking" one of my agents (there is a long story here, won't share details). He changes his email address all of the time so blacklisting his email is not a thing. I tracked his IP and it is always the same, so decided to ban it. 

However, this seems to be an option only in ZenDesk Chat, not Support - why? Any workarounds? Any plans to have that in Support too?