My primary use case for this issue is when lying sideways, holding the tablet sideways to read on the Kindle application. The tablet thinks it should be in landscape mode, but I want it in portrait mode lying sideways with me so I can read it. The Kindle application can lock itself, but it always does so into landscape mode on tablets. This is inconvenient since it is easier to read on narrower displays (it's trickier for your eyes to wrap around to the beginning of the next line the longer those lines are).
Using the CyanogenMod beta I came up with a workaround - be sure you have the 180 degree/upside down rotation position disabled so that the display won't flip upside down - now when you turn it upside down it will stay in whichever portrait rotation it was previously in. Unfortunately, I was not able to figure out a similar workaround in Beast ROM since the display always rotates, even to the 180 degree/upside down position.
Now I might like to switch back to CyanogenMod in the long term (I use it on my Nexus One and like all the options and developer goodies it gives and it's kinda neat/convenient to be running similar software on both devices), but I think I currently like the Beast ROM better since it feels more solid and less buggy (it's particularly embarrassing trying to explain to friends why the camera orientation is messed up in CM >_>).
Anybody have any other solutions/workarounds for this issue? particularly something that might work with Beast rom?