asterisk users - Nov 2008 - Agent Question

I define my sip users (phones) by using a macro. Is it possible to dump
these into an agent pool automatically w/o requiring a password either in
my extensions.conf macro so I could always have one dial syntax throughout
my dialplan instead of the array of SIP/{ext} I have currently in my dial
commands?

Looking at Call Queues with ringall is what I am after, I just want it so that
phones don't have to login as an agent, or have that happen automatically if
possible.

Thanks!
jlc