As of right now you cannnot. But, that's not to say that the crew at Theory11 wont come up with it sometime soon. They've already proven to us that they are there to listen to what we want/need.
This has also been brought up a lot. Even by me, so if I had to guess...I'm sure they'll eventually put it out. I'm thinking that they might sometime around when the 2nd edition Guardians are released to us.
Shane K.
