...If it isn't possible to export vectors then if somehow we could batch-trace them it would be awesome. Regardless there have been opensource libraries to help pack files into SWF.
I think that is not such a good idea...
First synfig files is already vectors (if not working with imported images), exporting these to bitmaps, then trace these back into vectors is just dumb. The resulting shapes will be far from optimized. To get proper shaper with tracing tools you need very high settings which also makes for large file sizes, then you can just as well go with movies to start with.
Second the shapes will not stay true to your original artwork, even if the settings is very high there will be differences.
Third, what makes flash vector format so good and usable for web is that the shapes is altered through time, it's animated at playback, thus keeping file size very low. If tracing images it would still be a series of images, but vector images stacked up rather than bitmaps in a movie file.
If it can't be done properly, as animated svg or flash swf files I think it's not worth putting time and effort in. The result will be far from optimum and not very useful. But it is your time, do what you want with it.