In Emby Theater if you have a DVD folder rip, Emby Theater displays the label "DVD". Presumably it does similar things for Blu-ray, HDDVD, etc. Since Media Stubs support "source flags," it would be useful/helpful if Emby Theater would display the corresponding label (eg, DVD, Blu-ray, HDDVD, etc.) derived from the source flag (otherwise, what's the point of the source flags?). This both informs the user of what type of disc they're looking for (in the event that one organizes their discs by format), as well as giving some indication of the resolution of the disc (inferred simply by format), which is pertinent for instances where a user also has a given movie available via services like Vudu, perhaps in a higher resolution.
PS - If this is something you might like to see implemented, be sure to "Like" this top/first post (as well as any subsequent posts in this thread that highlight particular aspects of what you are interested in) -- "Liking" the top/first post helps the Devs to know how much interest there is in a given Feature Request.