Email Configuration in Process chain

Hi Gurus

I am doing email notification configuration in process chain but when I go to "maintain Recipient List" I can find only 4 Recipient Type , Would you pl advise how can I add more types for example SMS , Fax number etc...

Also I don't see any users added to the Recipient list and when I try to add them which Type i should select for the company's ID?

Appreciate your help

Kris