There is a camera example for maemo that comes with the maemo sdk image called example_camera.c that is an example on how to use the camera and take images use v4l framework. It also has a bit of information on how everything works.

From my brief look it does not offer any of the functionality that the manual for the ISP suggests is possible. That means that the features and settings will need to be changed via driver parameters.

The example_camera.c could be a good base for taking pictures and the unloading and reloading of drivers with parameters could occur when the program is loaded.