cool to see that you found the way of moving animation !
hummm,
and here you are :
… where Synfig start to be powerful !
The power of export and connect value in synfig.
wiki.synfig.org/wiki/Export
wiki.synfig.org/wiki/Reuse_Exported_ValueNodes
wiki.synfig.org/wiki/Connect
wiki.synfig.org/wiki/Linking
and after, you will be very happy to learn about stickman and animating characters :
search.php?keywords=animation+character&terms=all&author=&sc=1&sf=all&sk=t&sd=d&sr=posts&st=0&ch=300&t=0&submit=Search
search.php?keywords=four+leg&terms=all&author=&sc=1&sf=all&sk=t&sd=d&sr=posts&st=0&ch=300&t=0&submit=Search
see(:ya!