I don't see that ever being added. It would require using ucon profile 3 to get chat logs and that will increase server load drasticly. We are here to ban cheaters not play language police.
We would need to have permission to do that from the sites we import from. One of them does not want any ban list generation or search features. My guess is because they use banners as revenue and want the traffic.
Who knows it may be possible in the future, the big limitation right now is PB won't save md5 checks to a file plus it overwrites the pbsv.cfg file on the server when issuing pb_sv_writecfg.