I don't mind stealing the quests, do the reward bags all have different IDs/nbt or is it the same for the bag but truly random what you get?
Its a singleplayer custom mod pack so I can just ignore the book if I want.
Also I can't seem to find out how to add items to chests with minetweaker.
If you are using 1.6.4 it is whatever ItemID is assigned to the item (e.g. 635) if it is 1.7 it is it's name ID (e.g. minecraft:stick)
As for minetweaker:
1.7 code-
This will possibly add 6-9 seeds to chests
vanilla.loot.addChestLoot("dungeonChest", <minecraft:wheat_seeds>.weight(60), 6, 9);
1.6 code-
This will add 1-5 sticks as possible loot
vanilla.loot.addChestLoot("dungeonChest", <item.stick>.weight(100), 1, 5);