I know there's SOUL. But perhaps Pharo can do the following without any additional packages: How can I restrict searches for senders and implementers to a certain category? Like: I want to see all senders of compile: in OmniBrowser.
More generally, how would you go and find the spot where compilation is invoked from OmniBrowser? (I roughly remember that some special code text pane was responsible for the compiler invocation, but forgot the details.)