if it's anything like what VW offers for DCC, the modes will also affect weighting for the steering, throttle response, and how open the exhaust is. on my golf R, that last one
opens the valves for two of the four exhaust pipes and tweaks up the soundaktor for more in-cabin engine noise...
There’s plenty of things other than just the shifts of the transmission that can be messed with for different modes. One of my motorcycles has 3 different “modes” you can choose, normal sport or tour. On it, for the most part it just adjusts the throttle response, sport making it snappier so takes less twist of the throttle to get more, tour goes the other way, makes throttle smoother but longer twist if you want full throttle. On a 4 wheel vehicle there’s even more systems to adjust and mess with. So while it won’t effect the manual transmission because that’s controlled by the driver, it can change all sorts of other things. Even with a manual there’s a lot of computer control for everything else.
Never used Eco mode but I suspect it softens the throttle response. Some (like me) think this is not conducive to economy as I’ve read that it’s more economical to quickly get to speed rather than slowing speed up.