> As a comparison, the ENB mod for Skyrim allows dynamic lighting in that game, but to actually use physically plausible light locations rather than the base game's prebaked light maps essentially requires redoing the lighting for all the locations in the entire game (there are several mods that do indeed do this.)

Skyrim doesn't use prebaked lights and shadows at all. That's why you generally only have a handful of active light sources per scene with everything else being filled in with ambient (interiors) or sky (exterior) light.