ok i did some searchin and found this, let me know if this works..
I checked my desktop and was actually able to get to the hibernation/standby/power options on my laptop, with TinyXP. Just goto Start -> Run, and type
C:\WINDOWS\system32\rundll32.exe C:\WINDOWS\system32\shell32.dll,Control_RunDLL powercfg.cpl,,
TYPE ALL THAT IN THE RUN BOX AS ONE LINE
then hit OK. Should bring up the window with the options.
If you enable hibernation and it does NOT appear when you look at the shutdown list, try holding down shift. For me it only shows Standby, Shutdown, Restart, if i hold shift it replaces Standby with Hibernate.