You could always try Macro scripting..... a simple google search will reveal several sources with a variety of solutions.
To kick off these macros via remote you can use IR or other type of systems control via dinky link as the equipment sounds like is minus line of sight.
Simplified you can try to run a scheduled task that kills the PowereDVD.exe application at some scheduled interval, but this is now time based and not really automated shutdown.
It would be nice to have a Cyberlink SDK for system integrators to develop customized control solutions.
Good luck, and hope it works out!
Cheers!
Corey