You are right in that things operate very differently with the 6.1x version of the component. The headers are generated dynamically from the item you choose for the list display.
If I choose to show the duration, for example, the header text for that row/column is "Duration."
You can change them, but you need to edit the file /Languages/en-GB/en-GB.com_biblestudy.ini.
Look for the pair: DURATION=duration and change this to whatever you want the text to be. Note though that the word duration in other parts of the component will also change to that new text.
Hope this helps,
Tom