You could put the package in a .dmg that places the .pkg in /tmp, then use a script to run (set as AFTER) as the current user to install the pkg. Something like this:

#!/bin/bash
currentuser=`stat -f "%Su" /dev/console`
sudo -u $currentuser installer -pkg  /tmp/Polycomblahblah.pkg -allowUntrusted -target /

You may need to experiment with it to make sure that particular package will run like this.

Running anything as a user instead of root is a VFAQ here. In your case, there's a couple ways to do it. If I had this task, I would do it this way.

1- create a script to run the installer and save it as /usr/local/anniwayy/installPolycom.sh

#!/bin/sh
#run the installer
installer -pkg /usr/local/anniwayy/PolycomRPD.pkg -target /
#remove the launchAgent so it won't run again
rm -f /Library/LaunchAgents/edu.anniwayy.installPolycom.plist
#remove the script to clean up
rm -rf  /usr/local/anniwayy/PolycomRPD.pkg
#remove the package
rm -f /usr/local/anniwayy/installPolycom.sh

2- create a LaunchAGENT to run the installer in /Library/LaunchAgents/edu.anniwayy.installPolycom.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>Label</key>
        <string>edu.yourschool.anniwayy</string>
        <key>ProgramArguments</key>
        <array>
                <string>/usr/local/anniwayy/installPolycom.sh</string>
        </array>
        <key>RunAtLoad</key>
        <true/>
</dict>
</plist>

3- Set the permissions right.

chmod +x /usr/local/anniwayy/installPolycom.sh
chown root:wheel  /Library/LaunchAgents/edu.anniwayy.installPolycom.plist
chmod 644 /Library/LaunchAgents/edu.anniwayy.installPolycom.plist

4- Put those three items into a package with composer. Then the next user that logs into the computer will have Polycomm installed.

Use outset

1.Place script in login-once/login-every folder
2.Done

Does anyone know why, no matter what package I supply (even one I created that does nothing and does not require root or admin), the installer command tells me I have to be running as root? I don't see how these instructions would work unless I am missing something here.