Wayne that is correct about version 5.0
Follow this link to the developer's notes on BETA version 6.0. Look at the release notes dated 28 September 2009 and you will see what the BETA version 6.0 can do, including OBC enabling.
Porsche Diagnostic Software Version History | Durametric
"Second release of Durametric 6.0 Added Coverage for 996 and Boxster (986) Many new features that are not available in Durametric 5. Here are some examples
Enabling and disabling the On Board Computer (OBC). Even though this is technically "coding," it is included in both the Enthusiast and Professional kits
Clearing fault codes on Alarm, along with other alarm features like activations and input signals
Brake bleeding
Convertible top calibration on 996 Cabriolet Activations on most modules
Coverage for every possible control module on Boxster and 996.
New for version 6.0: Litronic headlight control"
You can run version 5.0 and 6.0 at the same time. I have seen the menu to activate the OBC in version 6.0 NOT in version 5.0.
I guess they are working out the last few bugs in version 6.0 and have not updated their FAQ section on their website yet