thanks for the responses. Pointed me in the right direction. I now have this working. I have basically created a package which drops the plist without the UUID appended into /var/tmp. I then have a post install script which appends the UUID to the plist and copies to the default user template.
This is the script if it helps anyone
#!/bin/bash
#Author James Durler
#Written 3/10/2014
#This script is deployed with the iPhoto No Launch When Connecting Camera.pkg. The package drops a plist
#which specifies to not launch iPhoto when the user plugs a camera in. The script then gets the machine UUID
#and then appends this to the end of the preference file as this plist exists in the byhost and appends UUID
#to the end of the plist. Once the name has been changed it then copies the new properly formatted file to
#the default user template.
#Revision 1.0 : Improved the system_profiler command time to return machine ID by running the command at detail #level basic
#path where the imagecapture2 plist is deployed by the package
filepath="/var/tmp/com.apple.imageCapture2.plist"
#grab the machine UUID
machineid=$(system_profiler -detailLevel basic | grep "Hardware UUID" | awk '{print $3}')
#append the UUID to the string .GlobalPreferences.
imagecapture="com.apple.ImageCapture2.$machineid.plist"
#copy to the default user template
if [ -d /System/Library/User Template/English.lproj/Library/Preferences/ByHost/ ]; then
#move the file from /var/tmp to the default user template
mv $filepath /System/Library/User Template/English.lproj/Library/Preferences/ByHost/$imagecapture
else
#Create the directory if it doesn't exist. I have seen some circumstances where the ByHost folder is not in the default user template
mkdir /System/Library/User Template/English.lproj/Library/Preferences/ByHost
#move the file from /var/tmp to the default user template
mv $filepath /System/Library/User Template/English.lproj/Library/Preferences/ByHost/$imagecapture
fi
#exit gracefully
exit 0
