Editing xconfig file won't work because:micechal said:Just a quick guess would be to see it in the scenes.xconfig file which keeps your scenes and sources properties. I'm not sure though because I'm on a phone right now so I can't check.
Source/BitmapTransitionSource.cpp:196:
if(transitionTime < 5)
transitionTime = 5;
else if(transitionTime > 30)
transitionTime = 30;