I remember making quite a few adjustments to increase the level cap, but I’m not sure if it’s that simple for the main campaign. It does appear that most mobs would scale up to around 250 by default. You should look in this section for my guide on it.
This mod isn’t available, but it does have infinite scaling
I saw someone else do one with around a level 200 cap for mod.
Some DB reference points
Max Level, Database Records, Creatures, PC, playerlevels.dbr (experience Levels)
Level Formula, Database Records, Creatures, PC, playerlevels.dbr (experience Levels)