Change associations details more easily

[finsterwalder]

I would like to be able to change association details much more easily than with the association properties dialog.

For example: I would like to be able to right-click one end of an association and in the context-menu choose one of several predefined multiplicities for this end of the association.
The same for navigability.
I would also be great if I could easily change the role-name as well.

Greetings,
  Malte