<cheeky code-clueless heckler mode/> You're doing major coding mods, and you DON'T KNOW ALL THE POSSIBLE OPERATING MODES?! For shame! </hc-chm>
Seriously, a lot of people do use the real-time baro correction. With full-power 20-20 hindsight, it does seem pretty obvious, and I'm surprised that it's taken this long for it to be recognised as an issue. I would wager that a 2x2 chart (adder deg vs Baro kPa; 0 @ 85, -3 @ 100, to use Philip's example above) would solve most of the problem. I'd be surprised if a 6x6 chart was needed.
Philip: You're somewhat correct in your analysis regarding momentum, in that there are more molecules sitting in the intake manifold available to be drawn in.