A plugboard "modifies" some of the data on a book as it is being sent to the device. For instance, in the first post of this thread I give an example of how to include series info. in the title of the book. Look for the section "Changing Book Titles to include Series Info".
I personally use the third option listed there, and modify the book's title to <First Letter of Each word in Series> - <Number> - <Title> type
Code:
{series:re(([^\s])[^\s]+(\s|$),\1)}{series_index:0>2s| - | - }{title}