It will always help :).

For example I want to add matcher/rewrite tool as tab which will work on selected scope.��

So in system browser it will allow search/rewrite in selected package, selected class, selected group.

And same tool will be very useful in message browser too: ability to search/rewrite over results of method query (senders/implementors).

I have in mind a couple of other extensions for both browser types.��

And I hope people will contribute in this direction when I document how extend Calypso