Guys, guys, I came up with a neat home rule!
How about you could learn skills and certain traits from each other?
So let's say that your teammate has learned something useful. But you'd like to know that too, because you can find an another use for such a fabulous skill.
You go "hey, this is neat, show me how you do it!", do some narration and ask me for permission. If there's no obstacle, you pay 125% of normal cost in xps (the normal cost being the one paid by the character that you are learning from) and acquire the skill.
Also, I think that the teacher would earn some xps in the process.
How does that sound?