s7 has :allow-other-keys.  In a previous life,
I used it all the time.  I was composing using
a note-list that could be enormous, calling
instruments that could easily have 30 parameters
(these were experimental patches so all kinds of
things needed to be settable); keywords and defaults
made it possible to reduce the clutter by a
large factor.  In that context you want to work
quickly and not worry about dumb details --
:allow-other-keywords was very helpful.