Can I change a sequence arrow line thickness per arrow?

Question

Would like to represent control signals with thin arrow lines and data as wider arrow lines, is this possible?

skinparam sequenceArrowThickness 1

The above line in my testing, sets all arrows in a sequence diagram to the same thickness.

Thanks!

Answer 1

This should work, but is not working due to a bug:

http://www.plantuml.com/plantuml/uml/SoWkIImgAStDuKfKq8qkoSXCpivBBIwsDOsrKqZYSaZDIm7A0G00

Answer 2

This can be achieved in a similar fashion as setting inline colors:

@startuml
a -[thickness=5]> b
@enduml