The change you've observed came about somewhat by accident, as the code that manages the outline view that contains the Chapters list in Audiobook Builder is the same as what we use in CheckBook and CheckBook Pro for managing things like Split line items, where users need a spreadsheet-like feel when editing lists of data and using Return/Enter to move from row to row while remaining in an editable state is a time saver. We modified Audiobook Builder 1.1.3 this morning to behave the way you're expecting so things should be back to normal when 1.1.3's officially released. If you'd like to give 1.1.3 a test drop us a line at
feedback@splasm.com and we'll send over a download link and testing instructions.