I would also like to be able to extend the time of exposure to way more than 1 sec. Ideally I would suggest a real manual setting of exposure, an endless exposure which is just terminated by pressing the button a second time: first click to open the shutter, second to close it.
My goal are experiments with light painting.

A workaround would be a command line access to fcamera using all parameters as options. Maybe someone can help on this.

Thanks