Startup with variable resolution and framerate?

[Dalsim]

Hello,

I am running Xbian 1.0 beta 1.1 on my Model B 512mb Pi.

I would like to be able to power up the Pi without turning on my AV amp and TV but when I do this, Xbian defaults in 720p 60hz. Any video files I play will also only play at this resolution and framerate but I want to play files in their native resolution and framerate. I have changed the system setting to display at 1080p and I have also enabled "sync framerate to match video" in the video settings. The TV and amp are capable of 1080p 24hz and if I turn on the Amp and TV before the Pi this all works fine in full 1080p and the video's native framerate. I tried adding the
'hdmi_mode=32' to the config.txt but then everything plays at 1080p 24hz which is no good for some video files I have.

Is there a way I can turn on my Pi without having to turn on the Amp and TV but still get playback of all files in their native resolution and framerate? I am guessing I need an EDID.dat for this but I do not know how to make one and could not find a thread or google result for this, so if anyone knows of a guide for beginners, that would be great. Or another solution?

Any help is appreciated. Thanks