making the db files readable by humans is a bad idea. If you can read them .. so can hackers. as far as your disputes go, I fail to see how if 1 user registers a nick/chan, another can claim it since a simple /nickserv info nick all or /chanserv info #chan all will display all you need to know about the nick/chan. If the second person claims a nick/chan, have them tell you what the email address that NickServ/ChanServ has on record, if it doesn't match .. it's likely that it's not their nick or channel.
Secondly, reading the db files directly won't tell you anything different than NickServ/ChanServ will tell you on IRC .. after all, the db's are where they get the information in the first place.