Some time ago I was wondering why the external flash in live view didn't work using ML options, Well this might be good info for one of the developers like
mk11174 or Alex, The SL1 or 100D, Does fire external flashes in live view, I'm not a developer , but probably one of you guys could check the code and see
how it goes to apply it to the 650D, 700D or probably to all those ML Cameras that don't do this,