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