I didnt noticed/imagined old games still uses the "XMB In Game v1", good find
Old games doesn't have APP_VER inside the SFO, and without it there is no way to install a patch to change flags to add new features or to add trophy support, so it seems that are "not updateables"
There is a screen where it says if the MIC is supported or not ?, i never used it but sounds like a good idea to see if the flags changes something in this screen
I thought too that there are not sparkles when booting a game in higher firmwares, but after looking at it lot of times... are still there, is just the effect is almost not visible, are scaled and faded out very fast (0.2 + 0.3 seconds if the animation file i saw is correct)
About more versions of "XMB In-Game" ?, i tested all the unknown flags fast, maybe i didnt noticed, but there is not much "unknown" in the top of the table, so only one more as maximun (and this will move the unknown "chat" to the bottom)
Im not sure... looking at the positions in the table, it seems the last "unknown" at the top can be the chat