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in the palette of the activity diagram, you give the possibility to use the "send signal" image. but the "wait for input signal" image is not available at all! why? you can see the icon here http://www.developer.com/img/articles/2003/08/11/UML07T4.gif
Accept event action may need to be added, should be easy to add. may be addressed in 7.0.
require more work the initially expected: palette icon design, model element, scene object.