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Many users request that the tool allow users to specifiy what to display for operations on class diagram, e.g, hide the visibility, return type and/or parameters, so the class diagrams will be smaller and easier to manipulate and print.
This feature is definitely needed to make the UML-diagrams usable (in the sense of "viewable"). Otherwise diagrams get much to wide and they can not be exported or shown at a usefull scale. It should be also possible to move the connectors of the connecting arrows to user defined places and not automatically place them in the middle of a class box. This would greatly improve readability because skew lines are visually very distracting. But this is probably a different RFE...