This is one of those things we've been dealing with for so long ("that's just the way it is"), I didn't even think to wish for until now (when I saw that Bluebeam can do it): remove a selected leader (instead of just the last one created).
@Anonymous please introduce this feature. It's painful when you have multileader text and you have to delete "good" leaders that you need to stay in order to delete "bad" leader. Very time consuming. Please fix.