Please provide a way to inline style Use Cases border color.
Example syntax: usecase foo #orange;line:blue would set the background orange and border blue
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With last beta https://dl.dropboxusercontent.com/u/13064071/plantuml.jar
You can have:
@startuml usecase foo #orange;line:blue (dummy) #orange;line:yellow @enduml
This syntax works in some other place but is not well documented yet.
Tell us if you find issues!