Hello John,
Having the latest version is always a plus for stuff like bug fixes and new features but for this exact case I am not sure if there is something specific that is changed in version 6 that would assist.
Yeah, if you try and attach all those files into your PP5/PP6 document it is a recipe for disaster. Your PP5/PP6 file would end up being used and working in the document would become very slow. Dynamic imaging was actually created just for cases like this.
If you have any questions along the road, feel free to post away and we will be more then happy to assist you.