Because of atium and lerasium alloys, there should be more than 30 other storable attributes that we don't know about yet. What could some of these be? Here are a couple of my ideas.
Size: spend time being a little person, then tap it and temporarily be gigantic (yes, Ant Man is my favorite superhero. Why do you ask?)
Light: spend time not reflecting any light, then later you can be a human flashlight
Emotions: store up some happy, then tap it on a bad day
Attractiveness: hahahahaha
Awkwardness: ok maybe this one isn't very likely, but I can dream.