Few interesting features

**Is your feature request related to a problem? Please describe.**
Hi, few features that I cannot find:
1. Drag n Drop
2. Current "selected" node/link
3. Pinning links to positions

Do they exist or should I implement them myself?
Do you plan on adding them in the near future?

**Describe the solution you'd like**
1. Having some general drop reaction
2. Highlight and trigger event on node/link click
3. Clicking on a link creates a pin

**Describe alternatives you've considered**
Looked in the live-demo. is there another source of documentation?

**Additional context**
Any suggestions on how to implement the above as "plugin"s for the basic node?