
Thanks to efforts of Max May (aka Permutator) the development version of Synfig got following improvements:
- New “Speed” parameter to adjust the playback of child layers.
 - Dropdown list to select active layer in Switch Group.
 - Fixed #766: “On” and “Off” states of a “Switch” node were linked by default.
 - Allow to convert “Time” type to “Real”.
 
You can test those features by downloading development builds of Synfig:
Windows
Linux
Mac OS X