[Yum] Loss of pkgpolicy in yum-2.1 : how to deal with using 3rd party repositories selectively?

[Max Bowsher]

In FC2, I used to use DAG and ATrpms for a few additional packages. Setting 
pkgpolicy=last and giving the additional repositories ids prefixed with 00 
allowed me to easily get 3rd party packages when no official package 
existed, but without receiving 3rd-party updates to packages for which an 
official package exists.

Is there any way to accomplish this with yum-2.1.x and FC3, now that the 
pkgpolicy feature has gotten lost in the grand 2.1 restructuring?

Max.