Hi,
I uploaded a new version of my fix to the Inbox (System-ul.498). The way it works is similar to my previous attempt - the difference is mainly in performance. There's no need to recompile methods in this version and the search for referrers is also faster. Another additional performance improvement is in Traits-ul.290. It changes the way Traits are iterated over. Since it makes SystemNavigation >> #allBehaviorsDo: faster, therefore it improves the performance of many SystemNavigation methods, including #allCallsOn:. If there will be no objections, then I'll push these packages to the Trunk in a day or two.
Cheers, Levente