I also dont like the idea of giving the big G a list of my domains and having them do whatever they want with that info.
Maybe they will crosscheck the list now or in the future to see if any crosslink. Devalue those links cause they know its the same domain holder.
Ok thats my tin foil hat rant of the week.
Couldn't they technically do that already if you in any way add those domains to 'webmaster tools' or 'google analytics' ?