This is something I'd very much like to see happen: "Favor gained from leveling up, quests, and achievements can no longer push your favor with a particular Giant to its maximum. Instead, the favor stops at 1 below your maximum favor, requiring a small donation to receive the emblem."
While the favor we gain from these activities are small, they can also be unpredictable and are capable of really screwing you up. I just started Better Learning V. As everybody knows, getting in the maximum amount of skill time reduction as fast as possible is very important, particularly on longer skills like BL V. The more time goes by, the more possible time reduction is lost.
So I'm going to the Lem altar to make a donation before the new day arrives, and I bring it from 0/2000 up to 1975/2000. Woops, I accidentally leveled in doing so, gaining a miniscule 150 favor that pushed it over the edge, wasting over 1000 favor. That's about three hours worth of learning time lost. Actually all six, since I don't want to spend emblems.
It's not the first time, nor will it probably be the last. It's one of a couple of mechanics that occasionally blows up in the player's face.