One of the ideas I got on the German FileMaker conference:
Add a menu entry to the contextual menu to open the script from a perform script step:
So when you have a script step to perform a script, you can right click it, pick the open command and jump right to that script.
Coming to the MBS Plugin pr3 soon and already localized for all languages FileMaker supports.
PS: For FileMaker 14 and 15.