Rofl, I was surprised there wasn't at least a way to reset it either. There's been many a time when I have tried a font setting and realised it was too big, too small etc. Hence prat to the rescue. The font setting side of the addon is all I am using it for
At least conciously.
Although the GUI plugin may, come to think of it, allow people to reset it. I've never used it myself so not sure what else is there font wise.