> I seem to find myself often wanting senders and implementers only scoped
> within my category or package. Is this common? Is there some reason why such
> an operation is not easily menu-accessible (as far as I can tell)?

The OB Refactoring Tool integration can do this. Sort of.

Cheers,
Lukas

-- 
Lukas Renggli
http://www.lukas-renggli.ch