Rotation (app/hack/flashable zip)?

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In the process of buying accessories for my Sensation, I've found a car mount that I really like. The only problem is that the mount covers where the charging port is. During Navigation, I can't have my phone just sucking that juice. I can remedy this by installing the phone upside down, and it would seem to hold just fine like that.

My problem is that Sense does not support 180-degree rotation. Navigation, nor none of the apps, recognize that my phone is turned "upside down". I'm not looking for an orientation locker, as I'm not concerned with that. CyanogenMOD comes with an optional "180-mode" not found in any other ROM.

Is this an extractable apk, or flashable ZIP? I know it will be in the Sensation build of CyanogenMOD, but I'd like to experiment with some of the other ROMs in the mean time.

Any suggestions?

as long as you pick a rom w/o sense 3.0, it will support homescreen rotation...no need to wait for CM7 just for that feature