That's the dream. And the reality matches it now:
The Javeleon team, from the University of Southern Denmark, i.e., Allan and Michael, and their instructor Bo, have done an incredible job. Please try out Javeleon and provide feedback, they really need it. The latest enhancements were made on the basis of a training course I did at the university recently, hence the sample in the video uses the same scenario as used during the courses. I tried it out myself, and it works perfectly, i.e., no restart of the app is needed during development.