When editing an EJB-WS using the Design View, it is possible to add and remove operations.  Adding an operation pops up
a dialogue in which the user can specify details including the input/output parameters.

However, it is not possible to modify these parameters later without going into the source.  It should be possible to
"relaunch" the dialogue by later double clicking on the operation for the purpose of modifying the parameters (to affect
the method signature but without affecting any existing code).

The Design View does allow the parameter name to be directly modified (but not the parameter type). Another option is to
enhance the editing capabilities of the design view itself to allow parameters to be added / removed and provide a
dropdown for the parameter type.