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Thanks for the idea!
With last beta http://beta.plantuml.net/plantuml.jar you can now have:
@startuml skinparam wrapWidth 100 start :this is a very long component description; @enduml
Yes, for that now use style (instead of skinparam) and MaximumWidth, as:
@startuml <style> element { MaximumWidth 100 } </style> start :this is a very long component description; @enduml
See doc. here:
Regards.