I'm willing to consider it, but such a patch would need careful testing across browsers. It substantially complicates delivering updates at a fixed framerate, since it typically respects the refresh rate of the display.
Keep in mind that it would be necessary to patch both the main loop in octo itself and the one in the standalone stub.
There's a large corpus of programs which could be used to test changes on the chip8 archive. As I recall, the program Piper is particularly fragile, since it uses an unusual approach to framerate control.