Is it possible to limit the list of contacts in WhatsApp?

Today, I installed WhatsApp, and I know that it wants to upload my complete contact list to its servers to see who else has WhatsApp, so it can create a contact list. I don't like this, and I prefer to give it just what it needs, maybe only five contacts for now. I have LBE Privacy installed, and it blocks the contact list for WhatsApp. The result is that WhatsApp doesn't work. Now I can of course remove the entire contact list except for those five contacts, then unblock it, let WhatsApp connect, then block WA again, and hope it works. If I open the contact list, and go to the setting which contacts to display, I see several options: all contacts, WhatsApp, Gmail-account, and phone. Choosing one of these, only these contacts are listed in the contact list. But I guess WhatsApp won't bother and use all contacts anyway. In the contact list, I have hundreds of contacts with email-addresses and no phone number. Will it upload those as well? And if I take a closer look at those lists, they are not properly organized, so limiting If I add a contact later, will WhatsApp know? Is there a way to handle this properly, let WhatsApp have the addresses it needs, without giving it all?