re: Font Editor?

This isn't easy stuff. Text is stored as a vector files. Inscape cannot directly open a TFF file. But you should be able to put a TFF in your Windows Fonts file. Open a new file in Inscape. Use the text to type a letter you want to edit. Then convert the text to a path, edit it and save it as SVG. You're probably going to have to do it for every letter. There are ways to convert SVG to TFF. But again, this is not easy and I don't have any programs that can do this directly.