Denon can. You can assign a digital coax or optical to an input where HDMI is also assigned. Just did in on my 1613. Also tried it on the 591 in my bedroom.
You have to go into the setup menu and Inputs to change the digital assignments. You can set it to Optical, Coaxial or NONE. When set to None the HDMI audio will come thru.
Kind of a pain in the butt to do that each time you want to listen to optical from another source instead of the cable box. Plus the Denon models 2113 and below only have 1 optical input, so hope you don't have many optical devices.
You can't watch video thru the HDMI input and listen to internet radio, Airplay, tuner, or USB input at the same time though. That seems to bug many people.