You're absolutely right. I started to put the Group form in, but I never got around to actually implementing it. In the next release I'll fix this, and include Groups in the contacts and orgs views used for addressing.
Also in the next release there will be a a method of addressing mail to an entire organization
(You'll just be able to send a mail to all the contacts within an org without having to have created a Group or address them individually. I think this will be pretty useful).