Go to Sleep when the Music's Over

[rsbrux]

TV-Server Version: n/a
MediaPortal Version: 0.2.3.0 RC2 SVN
MediaPortal Skin: BlueTwo wide
Windows Version: XP MCE RU2
CPU Type: Intel Pentium 4 3 GHz
HDD: Samsung 250GB
Memory: 1 GB
Motherboard: FIC P4M-915GD1-LF
Motherboard Chipset: Fujitsu Siemens
Motherboard Bios: Phoenix 6.00 PG 10 May 2006
Video Card: Nvidia GeForce 6600
Video Card Driver: 6.14.11.6250
Sound Card: Realtek High Def. Audio
Sound Card AC3: no AC3
Sound Card Driver: 5.10.0.5319
1. TV Card: Hauppauge HVR-1300 MCE
1. TV Card Type: hybrid (only analog section in use)
1. TV Card Driver: 2.119.25023.0
2. TV Card:
2. TV Card Type:
2. TV Card Driver:
3. TV Card:
3. TV Card Type:
3. TV Card Driver:
4. TV Card:
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4. TV Card Driver:
MPEG2 Video Codec: dScaler
MPEG2 Audio Codec: dScaler
Satelite/CableTV Provider: Telezug (WWZ) Switzerland
HTPC Case: FSC Scaleo E
Cooling: OEM
Power Supply: OEM
Remote: PDAwin.com TVRC 5.5
TV: InFocus TD40
TV - HTPC Connection: DVI

I'm not sure if this should be an "Improvment Suggestion", but I'm starting out by posting here, on the optimistic assumtion this is already possible, but I jsut don't know how.

When I set up music to play in MP, I usually like to stay on the "Playlist" or "Now Playing" screen. Nonetheless, I would like the system to shut down (actually hibernate, S4) when the music's over, if no other activity takes place on the system for a while (say 10-20 minutes). I have setup Windows Power Management to S4 after 20 minutes of inactivity, but this only appears to work when MP isn't running. I therefore have also configured the MP Power Scheduler plugin to S4 after 10 minutes of inactivity in MP, but this appears to work only when MP is on the Home screen. How can I get it to go to sleep from "Playlist" or "Now Playing"?