Editing and mostly deleting the history has been talked about in the forums dozens of times. But I think there has never been an official statement from Florian about the possibility to edit (or sort) the histories of those conversion tools.
I know the histories are stored in mp3tag.cfg but that configuation file is in binary and I'm not gonna try and edit it.
Currently I have 25 Filename to Tag format strings that I more or less use and the way I sorted them was to temporarily copy all of them to a text file, then clear all history and then enter them manually in reverse alphabetical order so they show up in the right order in the history.
So since it has been asked for a few times, would you consider adding a feature to make the history more manageable?