I think the current setup of AND/OR filtering in the advanced filter ad-on could be improved by being able to swap them over.
For example we can now show a view list based on if ...
(1 OR 2) AND (3 OR 4) are present in the view item.

What would be even better would be able to....
(1 AND 2) OR (3 AND 4)

It becomes much more specific with the results we can show if it was in this format.

A simple drop down option of the AND/OR options would fix this and let the users decide how they want the filtering to work for themselves.