Script that eliminates display of requesters we want to avoid?

Seems to me that there should be a script somewhere that eliminates display in our mturk listings of those requesters that we do not want to work with. Anyone know of a good one? I've looked at greasy...

Also, what is the motivation for those who have written these scripts to continue to update/debug them over time? I know in the open-source community that there is a lot of "love to do it" but in time burn-out does set in.