>  I change a VDR's setup setting from inside a plugin like:
>
> ::Setup.UseSmallFont = 0;
> ::Setup.Save();         // commit the change to setup.conf
>
> This is done only when the plugin's setting is changed. ( in the Store()
> ).
>
> When changes are accepted with OK, the setup.conf is written but it is
> immediately overwritten by a Setup.Save() call from
> cMenuSetupBase::Store(). How can I avoid this ?
>
> Is there a more orderly way to modify VDR's setup settings ?

Why do you need to change VDR's setup settings?
That's VDR's own business ;-)