generating ._cfg0000_foo multiple times between --sync

Hi guys,

I wonder why the default behaviour of portage is to generate
._cfg0000_foo 
files only one time after a --sync. For example I have done
the following;

- emerge --sync
- emerge baselayout --oneshot -v
._cfg0000_foo files are created so I can use dispatch-conf
to select which one 
I want to update

after a while I want to reset more files to the default
value so I do;
- emerge baselayout --oneshot -v
this time ._cfg0000_foo files are not created

When I do emerge --sync again and emerge baselayout
--oneshot -v 
then ._cfg0000_foo files are created again, however for me
this is not 
preferred, because I want to keep my current tree.

I remember vaguely that there is a setting to enable
generation 
of ._cfg0000_foo files always, however I have searched on my
system, forums 
and google, but I'm unable to find it. If actually this
setting exists you 
might want to enable it by default, but definitely document
it better.

IMHO portage should always behave the same whether you just
synced or not. 
What do you guys think? b.t.w I'm using portage-2.1_pre7-r5

Regards,
Michiel.

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