Tiny problem with the map slicing suggestion is how it might affect multiplayer. Larian will not entertain any suggestion that negatively affects multiplayer, which is a major component of what made DOS, DOS2, and BG3 unique in the CRPG space.
Also, if the engine can't handle dynamic lighting (kinda weird for a 3D cinematic RPG, but maybe there's a way to trick us into thinking the light is changing when it's not), then could it possibly do weather effects? Maybe having different or occasionally different weather after long rests could be good. There is such thing as sunshowers. It would give us more ambient effects and extinguish old fire patches, like at the Nautilloid or Waukeen's Rest after completing the burning inn quest.
