Customizability of volume buttons (and action button)#421

The left hand is well-positioned to manipulate the volume buttons and the action button. In iOS settings, the action button can be programmed to open the Fjorden app (long press), or to both open the app (long press) and capture (short press) when the app is already open. I’d love to be able to customize the action button further and to customize the volume buttons when the app is already open. E.g. in manual mode, it would be great to use the dial to adjust the shutter speed and the volume buttons to adjust ISO. Dedicated buttons, like what one might have on the DSLR. Along with the push for greater customizability on the grip, enabling customization of these additional native iPhone buttons would give a total of 7 dedicated manipulations!