Great news!
I'm not sure what you mean by plugins changing the directory. I was talking about the path to the original file. Are you saying plugins change this?
e.g. if the original file is:
C:\In\Ebooks\Science_Fiction\Verne_Jules\80days.ep ub then you would end up with the following custom fields filled (assuming you configured it to use those fields)
#titleid: 80days
#original_format: epub
#original_path: C:.In.Ebooks.Science_Fiction.Verne_Jules
Anyway, splitting the file name and extension will save me a lot of time when adding books to my libraries. Thanks again!