As I understand (someone correct me if I'm wrong), part of the savegame/pause UI is hardcoded and different for every game, and it would require a great amount of work (per game) to add all those quirks back in exactly the same way they were originally presented.
When I've had any spare moments of downtime between the craziness of my life lately, I have to admit I've thrown them all into Psychonauts 2. IT WAS GLORIOUS!
Hmm. These are straight up bugs once you look at the code and see what's going on. It's just like when they re-enabled the blocked dialogue tree in Grim Fandango. I think worrying about bugs being fixed is taking preservation to another level ("I want to play the version where I can't ask Domino about his plan!"). You always have DosBOX for the die-die-die-hards who want to see the original versions. I'm glad ScummVM is merging these fixes myself.