Is there a way to deactivate the lower camera button on the FP2? It too often happens that when using the phone it accidentally is pushed and the camera starts. Next to that there is the option to use the power-on button for it by pushing it twice. (so actually the camera button is not required at all) I searched the forum but did not find a solution.
By the way, the (outer) camera button in the case rim can be physically removed with a little care without damaging it (thus allowing re-attaching it later). I would try to close the resulting gap with a bit of tape or otherwise though to avoid too much dust getting inside.