Preventing Delphi debugging into VCL

Dale Ingold would like to modify VCL code but I would like to prevent 
Delphi, while I'm debugging, from jumping into th VCL. I found this key 
in the Registry:

In:

   HKEY_LOCAL_MACHINE/SOFTWARE/Borland/Delphi/7.0/Debugging

is the key:

   Debug DCUs Path

with value:

   $(Delphi)\Lib\Debug

Somewhere on Internet I found that changing "$(Delphi)\Lib\Debug" to 
"$(Delphi)\Lib" wil help.

Who tried this?

Any other solutions ? _Un_checking "Use Debug DCU's" doesn't help.


Thanks,
Fons.