zuluclayman

The problem with it being jerky is probably to do with the frame rates used in Flash - sounds like it is too slow. A frame rate anywhere between 6-15fps (and possibly more) will work depending on the type of animation you are doing. the best thing is to "taste and try" start at a few fps more than you currently have in your project and see how that performs when exported and keep going until you get it right - then write it down somewhere so you will remember for future animation-to-video projects.
If you have Vegas 7 you could use that for your animation - images in Flash can be exported as a bitmap or jpeg series which could then be brought into Vegas, choose the time each still image is on-screen for then export as a movie clip (mpeg or avi) to then be brought into your home movies. this is how I approach claymation - take the pics of a scene, bring them into Premiere with each image being on-screen for 3-5 frames, make this into an .avi with little compression, do this for all scenes, then bring them in to a new project as a movie clip and edit it as you would with any other video material.