Support for the PARMLIB installation/config process has been in OMEGAMON for a while now. Most customers probably still use the ICAT install panels to config OMEGAMON, but over time with PARMLIB that is likely to change.
If you are interested in learning more about PARMLIB, you will want to check out this webcast on December 1st. "An improved approach to the configuration of Tivoli OMEGAMON" will cover the PARMLIB install process in detail. Cecile Day is the presenter, and there is no doubt she is the expert when it comes to the OMEGAMON installation processes.
I recommend taking a look at this webcast. PARMLIB offers advantages over the ICAT install process, and I anticipate more users moving to the new process. The event is December 1st at 11 AM ET. If you interested in the webcast, here is the URL to sign up: