[imp] whitelist patch...

[Amith Varghese]

> > I committed this for now. If anybody feels like this whole
> > blacklist/whitelist thing has to be implemented different than with
> > registry calls, he's free to change this.
> 
> Again, for the record, I strongly feel that the registry implementation is
> the right way to do this.

Could you be more specific about the registry implementation that you mention? 
I'll move the blacklist/whitelist functionality if I get some more details.

Thanks
Amith