We can already publish the game with unlimited frame rate mode. I read on the forum that even someone is using it to make sure that the app run smoother in all devices.
A strong warning is shown on export if you try to do that, because you should never publish a game with that mode.
What you are suggesting is an incredibly ugly hack that will not only prove very difficult to actually usefully apply, but could well make things even worse. It really is the wrong direction to go in. Just because you can doesn't mean you should.