Well, I've tried both of these apps, but f4l doesn't seem to be able to do anything on my computer (there still seems to be no dialogs at all: no object/layer properties, no app settings and so on, though menu entries for these are present).
Impress is a bit more workable, but I can't say that it's good at all. Everything is limited to a few forms, shapes ant text: Animation of an area when mouse is over it for example, seems to be impossible (at least I didn't find any way of doing it properly).
Isn't there any other app to do Flash MX's job??