Feature request: Fixed set that always contains all songs

I would like (the option) to have a sort of “Universal Set” available in the set list editor, that always contains all songs from the pool. Even better, if songs could be “tagged”, and set lists could be created by tag-selection.

Use case
I have a band that performs both with and without set lists.
When we perform without setlists, we select songs on the fly.
Thus, I need a set containing all songs in a set list.
I then use the search function in the playlist, to find the relevant song title during performance.

With a repertoire approaching a 100 song titles - and with titles sometimes added/removed - maintaining such an “all songs” set list manually, is time consuming and error prone.