I was thinking for a while that it’d be cool if there was some sort of dynamic linking that could be achieved between Shotcut and Natron much in a similar way there is between Premiere Pro and After Effects. A version of that is sort of done with GIMP and Darktable or RawTherapee when raw images need to be opened in GIMP.
The problem is that Natron lost all its devs. There is just one maintainer doing very light maintenance on it. Since that’s the case I’d prefer that Dan and Brian just concentrate on what they have on their roadmap for Shotcut. The best way to use Shotcut with Natron currently is to use lossless codecs like HuffYUV between the travel of Shotcut to Natron and back to Shotcut to avoid any video quality loss.