A “new” very interesting feature is not mentionned in the wiki : scripting.
Synfig code change quickly these days, but the synfig doc do not follow the rythm. It could be interesting that new features coder put, even very simple, lines in the doc.
Another things, i’m trying to do some little work for 0.65 release using “Rewrite preparation for 0.65 release” and adding some word in the Talk page see example for group layer