BlueGuy;
There was some discussion about allowing money to be added (via Paypal) for add-ons (excluding extra copies of the game). As long as no issues cropped up with that, there should be a Kickstarter update at some point with instructions and deadlines, etc, if it is implemented.
EDIT: actually, I checked if anyone looked into this further, and at the moment it isn't looking very likely. Sorry about that.
