Sasha, thank you. Have to dig into that. Will use ConTEXT, which seems better suited for editing .py files than Notepad.
Hopefully all commands hitherto contained in commands.cfg are contained in ...Options.py, we'll see. Obviously editing ...Options.py + adjusting the F1 help files is the only way to make everything consistent. Commands.cfg plays 2nd fiddle in this context, right?
TDW's migration tool will be even more valuable in future.