Like most other softwares out there, it'd be useful to have a "Plugins" system for Synfig too, but much better if we've got Plain Text files as plugins. The plugins can be custom scripted or downloaded, especially to extend Synfig's capabilities and adding dynamics or new tools.
Flash has AS3 but Synfig could have something similar by combining scripting and plugin in one go; script plugins! LOL Anywhos, I saw this todayhttp://www.newgrounds.com/portal/view/556571
..... and I realize that particle dynamics still need more work in Synfig. Man, I'd really like some snow in my movies. =\
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