We've just built a new beta http://beta.plantuml.net/plantuml.jar
With this one, you can have:
@startuml
skinparam wrapWidth 150
skinparam swimlaneWrapTitleWidth auto
| this is an exceptionally long title which now wrap at some pixels|
:You fixed it so this will wrap at 150 pixels thank you!;
|Ignore Me|
:ignore me;
@enduml
and also:
@startuml
skinparam swimlaneWidth same
skinparam wrapWidth 150
skinparam swimlaneWrapTitleWidth auto
| this is an exceptionally long title which now wrap at some pixels|
:You fixed it so this will wrap at 150 pixels thank you!;
|Ignore Me|
:ignore me;
@enduml
It should fit some needs. Tell us if you find issue or if something is missing.
Thanks