Re: Forcing 60hz with twinview.
I'm afraid that I'm not able to reproduce this on the 9300 that I have here. I have an external flatpanel connected, and it is capable of a 75Hz refresh rate at 1280x1024. The on screen display confirms that it is running 1280x1024@75Hz, as does the X log.
What kind of display are you using that is not running at 75Hz?