You can do it either way. Sentinel is easier if you have numerous changes to make, presuming you have these in a Favorites List. Just edit the Favorites List, navigate to the channels and make the change in the Audio Option column.
From the keypad, there are several steps. Menu>Manage Favorites>Select the Favorite>Review/Edit System>Scroll to the System>Edit Department>Scroll to the Department>Edit Channel>Scroll to the Channel>Set Audio Type>Analog Only>Set CTCSS>Select the correct PL Tone (which is CTCSS). Did I mention using Sentinel is easier?
If you are only scanning them from the main database, then you can't do much about that. Either build a Favorites List.
Submitting the change would be most appreciated and a good contribution to the hobby.