Import images to synfig is quite easy.
Just create a text file containing the list of images you want to import and name the file as yourfilename.lst (LST in lowercase). The default frame rate is 15 fps but you can easily change it by inserting the fps a the beginning of the file
and so on.
For more info read this:http://synfig.org/ListImporter
You can import as many files like that as you want.
If need they start to play at a different moment just modify its Offset Time value to a positive number (in seconds) if want to delay the animation and to a negative one if want to play it sooner.
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