I'd like to see some favor items introduced that get more powerful as a demigod levels. This could help fix a few balance issues with existing favor items, as well. Cloak of night, for example, might at level one be a very short ranged teleport that does far less damage than it does now, but once a demigod reaches the highest level, it would become a longer range teleport that deals muuch heavier damage and might have a secondary effect.
Either that or make the items level-able just like the default skills, adding another customization option to the levelling (A demigod could level its favor item, but at the cost of not using that point for it's own skills). It could just show up with the other skills.
Just an idea.
I'm hoping that given the levelling system it wouldn't be hard to add this.