I had 3 beast tribe allowances left when I arrived to find the reputation quest waiting. Did that, and I was rewarded with the 3 extra quests after I completed the regular ones, but I was out of allowances.
So, I'll just do them tomorrow..
NO! They disappear on the daily reset, and I was just left with the normal daily ones.

Perhaps they should also grant 3 extra allowances for the extra quests, since you don't really know when you're going to get the them and reserve allowances.