Hi Igor/Ben. I don't know if it was the correct path, but I commited NautilusCommon-MarianoMartinezPeck.58  which adds a new plugin: AnnotationPanePlugin.
It is based on Igors one and taken the class from OB. For me this is really usful beacuse it shows for each method its author, timestamp, mcz version, category, number  of implementors, etc. It does not show the number of senders because it is slow. 

So...is that fine?  

ahh btw, if you wonder how to do a script to enable plugins:

Nautilus pluginClasses add: { AnnotationPanePlugin. #middle }

cheers,

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Mariano
http://marianopeck.wordpress.com