This (or similar) was mentioned already:
https://bitcointalk.org/index.php?topic=3628036.0
 but nothing happened after, so maybe somehow we could put those ignore lists somewhere, where it's accessible for everyone (maybe on the FitToTalk forum, because it also help newbies to learn how to use bitcointalk...)
There's no solution for the problem of the users who are on the original ignore lists but have improved their posting skills since... so I know it's not a 100% reliable solution, but around 99,9% at least