A 'source' (or at least a list of bricks in placement order) window is on my to do list, maybe in version 1.5.
In the mean time I could add an 'insert step after (last item in) selection' feature in the next beta as it is very easy to implement.
In the mean time I could add an 'insert step after (last item in) selection' feature in the next beta as it is very easy to implement.