I was doing the same thing -- design in FOG, then output in Fontlab. Until FOG 5.1 -- with Opentype output I can work exclusively in FOG!!
Man, there are few programs I've ever used that are as frustrating as Fontlab. What a terribly unintuitive, confusing and convoluted interface. I don't know how anybody can do creative work in it.
I will give kudos to the FL people, though, for only making improvements to FOG, and keeping the good parts intact. The only feature that's still missing for me is glyph creation.