The plugin just takes every byte in the editor, formats/translates a few, reads the current style and sends that to a file, or uses wxPdfDocument for PDFs. The problem is the byte-at-a-time reading, 'cause in some cases a single glyph/symbol is made up of more than 1 byte (UTF-8 and such). I'll have to check that code again and try to find a good way around it.
The plugin has not a way to be configured, and by now the feature you're requesting seems to be the only thing that could be put in there. It'd be a very lonely dialog...
So, please be sure to file a bug report and a feature request at berlios for the record. I'll work on it when I get some free time.