Suggestion #2:
Named selections: - I did not find out how to edit them (even "suppress" would add flexibility and reliability).
                                - The list is not refreshed as session is closed (Windows). Thus opening and closing sessions one after the other results in merging the "Named selections" of all sessions successively opened...

In the current daily build if a named selection becomes empty (which will happen during session close for example) it will delete itself.  Does this meet the need you're describing?  Otherwise I could implement ~namesel for deleting them even when they're not empty...