.. or may be some part of yEd may be opened so we users can add some features there ?
An example: I'd like to allow yEd create new documents if the URL points to some local file that does not exist ; in the simplest case it is just creating an empty text file and starting an associated file editor by F8. Or create another linked .graphml document and open another yEd instance on it.
( Since I'm going to use this feature heavily, I'd also like to have some hot key associated with the "Data" tab in the properties dialog. )
All these changes are not that hard to implement ( at least for a few predefined data types like text/html/graphml ), so I imagine I could have done that and suggested "a pull request" if I had this part of the code open.
Anyway, please treat the above as a feature request )