[Asphyx]

I'm using Sensor4SDK and BsB_G-Config.
Sensor4 rotates any application based on the GSensor and you use the g-config to add apps to the whitelist of Sensor4 to allow that app to rotate.

If you just want a button option, changescreen is the better option. Stay away from things like gyrator I notice a high battery drain when I used that app and it doesn't work as well as the sensor4SDK