There's a cap remover included in the Ease-of-Use mod--you can find it on the mod sticky thread at the top of the forum page. Install that and the game still caps experience at around ~8 million, but that means you're level 40. And there's nothing a level 40 mage can't survive in this game.
If you do install the cap remover AND have ToB installed, you get a few more bonuses for being a high-level character. (I won't spoil any more than that--and I hope nobody else will either!
) If you don't have ToB installed, then you're only going to get 1 HP, 3 lore, and maybe a few new spell slots if you install the cap remover.