qtcamera.ini is in /usr/share/qtcamera/config/ Why do you need to modify it ? For N950 ? Unfortunately using zoom button for capturing is not yet implemented. It can be done easily but how does it work in practice? Normal shutter button is a 2 level button. half press to focus and then full pres to capture. zoom button has onl one level so if you press it, image will be captured without focus. Or am I mistaken?