If I display contents of the Plex Media Server app on my mac, I can get to a directory of XML device profiles. Since this includes things like iOS and other non DLNA devices, my assumption (which could be very wrong) is that this is where the server finds the device capabilities based on a lookup by device name. (again, I could be very wrong here)
If I'm NOT wrong, I should be able to modify the photo resolution for slideshows in the XML for my Roku (Latest Model Roku 2) by finding the appropriate XML file and changing or adding the required parameters similarly to how other XML files are formatted.
Does anyone know which one of these files corresponds to the Roku2? (options below)
Roku-3.1.xml
Roku-5000X-6.0.xml
Roku.xml
RokuDLNA-3.1.xml
RokuDLNA-5.1.xml
RokuDLNA-6.x.xml
RokuDLNA-4400X-7.x.xml
RokuDLNA-5000X-6.x.xml
RokuDLNA-5000X-7.x.xml
RokuDLNA-6000X-7.x.xml
Warning to anyone else doing this, your app will fail checksum on upgrades until you replace the modified ones with originals. I found that out the hard way.