Just a little thing I noticed; when selling through the trading centre, you can have an either/or option for currency when selling. (I.e sell for 1000sb AND/OR 1gb). However the OR isn't an option for Branch sales.
My suggestion is to add in the 'or' option for branch sales, so you can put up items for xxx sb OR xxx gb. Would be helpful when selling items that you are happy to get either set of currency for :)