I don't know if there is any app, or if its even possible since when it takes the picture it tries to focus. It sucks for me since i am always sort of shaking but i can still get decent images. Hopefully donut comes with a new camera so maybe it will get another upgrade.
I'm not sure if there is an app for that. Im thinking not. I never really know where its going to focus because it goes through the whole range before taking the picture. Kind of annoying how slow the camera is.