Another option would be to set up your own local repository and populate it with the oacs repository package and xml files, or build your own from the oacs CVS repository sources (if you have a workable method of obtaining the required files).
You can start rooting around in packages/acs-admin/www/install/index.tcl to set the repository location.
Lars might pipe-in if you're interested in doing something like this. I'm sure you're not the only one affected by lack of proxy capacity in aolserver. Lots of folks with oacs 5.x servers will be behind firewals, so this would probably be a good general solution.
