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Currently the only way to modify the output JAR file name is to edit the project.properties file and edit the dist.jar line. This should be an editable field in the project properties dialog.
Probably WONTFIX; there are lots of things editable in project.properties that we decline to provide a GUI for.
Sure there are many settings, but I find that the output jar name is one of the settings I change most frequently. Besides, there already is a read-only field on the properties page.
Setting the name (not path) should be OK.
Yes, it's the output filename I'm referring to: The readonly setting is already under Build -> Packaging in the project properties.