Character coding problem with Additional fields: It is working nicely only with English (ansi) text in title and in field content. It is not possible to give any name as title with accented character, like é, á, ő etc., as we must use in our language (Hungarian). The title not appears in that case.
In the field (with non-accented title) you can't use accented characters. After saving, the characters jumbled. Like this: "jól működik" changed to " ju00f3l mu0171ku00f6dik".
It must be work with utf-8 codes, please revise it.
Otherwise it is a nice plugin, congratulations.