First off, I just want to say how impressed I am by this program. I've only worked with the Light version, but I've so far I've found it to be a tremendous piece of freeware. Nice work!
One thing I've noticed that would be helpful: you say in your Help PDF that it's not advisable to place one outline over another when exporting to OTF. It would be nice to be able to have a way to combine them (like how Combine Paths > Union works in Adobe Fireworks: jonvs.ca/l/?36 ).
I've noticed that twice so far I've had to redraw characters because gaps would be noticeable if the font size were too large. For example, I'm creating a hand-drawn style typeface and I was working on the capital T. I started with a two-part glyph, but then it looked too much like the T from the Tim Hortons logo, so I decided to join the two parts. This meant having to redraw the bottom half by stretching the top half, since I couldn't get the gap to completely disappear at close zoom (thankfully T is a very simple glyph and easy to extend, but combining paths would be a great way to start drawing too).
Thanks for considering this, and again, excellent program.