One thing I've always had issue with in the mod in the loot being relatively lack luster most of the time. with the now extremely high chance of total destruction being a complete turnaway to actually attempt dimension dungeons (since items are being dropped when getting killed into limbo and such).

I'd like to suggest a config list that can be edited similar to how atomicstryker in his battle towers mod allows you to customize loot and how much loot spawns in each chest and level and how much of it spawns.
in your case, you can have varying levels of rarity loot chests in your dungeons (like the ones that just give books, and those ones that give like diamonds, threads and quarts etc) and you can allow players to edit what loot ends up in these, which would be very good for modpack makers who aren't well versed in such things as the various loot chest tweaking mods.