Maybe it’s asking to much but I’d love to see support for crow’s foot endpoints.
Here are two possible ways to do this:
New shape - This shape is a unique connector widget with endpoints that can be changed to the four different types of crow’s foot endpoints (one only, zero or one, one or more, zero or more).
New endpoints for existing connector widget - Simply add the four additional endpoints to the existing connector widget. May add unnecessary clutter.
This is pretty much the only thing missing during my day-to-day use. Product design has really done a great job anticipating most needs while still keeping the application simple and easy to use.