In the Cool VL Viewer, this is SHIFT ESC, so to avoid closing the open floaters and chat bar when you just want to reset your camera... The Cool VL Viewer specific shortcuts are in the "FAQ and general help" forum.
ahh... never thought of that one. (the shift key combo idea generally gets ignored by me and has notoriously for well over 25 years. (I guess I am still slowly getting used to this Graphic user interface doodad! lol
You can already view parcel media (video, webpage, etc) on a prim, though only one media per parcel and not one per prim like in v2/3 viewers which got the "Media on a prim" feature. This feature will come to the Cool VL Viewer too, one day or another (it's not considered a priority by me: mesh comes first, then probably multi-layered clothes), as a natural consequence of migrating more and more v2/3 code into it (and there are already large chunks of that "media on a prim" code, for now disabled with #ifdefs, already migrated together with the various backports).
I don't see any need for any more than one media on a prim per parcel. I tried using it in v2/3 and it overloaded my system with uncalled 'slplugins' the natural ending was, of course, system lockup. (I'm never going back to that crappy program again if I don't have to)
They broke the mold for programers like me decades ago, I'm afraid...