As I thought, nobody is able to help me ><.
I found some new things like the CPGURU widget which seems to do exactly what I want for 50$ :
Michael, the developper, figured out how to send the whole data avoiding the post results popup. I'd like to buy this but my superior doesn't agree.
I also tried to find by myself by decompiling(not sure of the word) the captivate published SWF:
Quiz data is send by a class named InternalServer extending a TrackingAdapter class.
Post results popup seems to be an instance of the "InputDialog" class.
If I can find the place where this AS3 script is generated I think I can modify it to match my needs.
I'll be happy to share the solution for free if I success.
Any clue ?