Simon,
As far as i know , if any objects (BPC) Changed or edited in the front end WI, it will not ask for transports as it does in BW. As you may know it is not recommended to touch the BPC objects in the BW backend direcly.
Every time the changes has to be done in the other landscapes otherwise the changes has to be documented well and it has to be manually collected and should do the transports based on the models/environments you want to
Hope this helps.....