olear, yes, I know many compositing application developers are sleeping. This is a wakeup call.
Audio sync would be an extremely useful feature - saying "others do not do this" we still would not have computers at all, as "others did not do it". Wrong approach to innovation.
I strongly suggest to look into realtime audio tools like ableton and combine ideas from that wolrd into compositing - this would make Natron a very special beast. From a dev standpoint this is not complicated at all, comapred to visual algorithms audio sync is easy, also many open source tools have already done the dirty work.
Also, when you do your syncing in NLE, how do you sync parameter animations to a beat in natron? At least a midi sync is heavily needed for anything that needs to hit the beat exactly.
I would be very happy if natron developers would see that seemless audio integration into a tool like natron would push it on a completely new level. Think Ableton Live, Push plus Natron.
Thanks for your attention!