Each IP should be unable to post on 4chan until its visited the site on at least 15 different days in a 30 day period, and default back to being unable to post if it goes two weeks without posting once.
Here is a better idea: go fuck yourself cunt.
4chan holds onto FAR too much user data as it is. Don't give the new jew any more ideas. His speciality is fucking over users by shenanigans with their data.