Referral lead of a Perspective Clients

Hi, Is it possible to have the address for a prospective client to be optional?  I get a lot of leads from referral sources and they do not always provide an address of the client.  It would be nice to have the lead and client fields set as optional incase we do not have a full name, address, or phone number of the potential client, and not have to add a dummy address and then go back and re-enter it.