thanks for suggestions. As already discussed, a list of updates is great idea and will be implemented.
Regarding ability to move with joining lines. This is currently not an easy task to do with current diagram engine. Unfortunately our current engine has a lot of limitations and it's a very hard to extend it.
On the other hand we already testing/working on completely new engine based on QML. Such engine will allow us a lot of great things including popups, animations, etc. But it's a not an easy task and it will take us a lot of time to before we will be ready to use it as replacement of current engine.