I would have marked your answer(s) as 'Helpful', but for some reason the options in the forum to mark any more posts are helpful is not available (is there a limit, or can you not mark as helpful after marking one as 'correct'?).
I know it doesn't give you any 'points', but your answers are appreciated and very helpful, so thanks a lot! 😀
However, I don't feel that having to download a third-party app to invoke basic Mac functionality IS the right answer!
I still think the Bettertouchtool is buggy/jerky to use even with the four-finger tap, and I still haven't decided on a decent workflow (that probably won't happen till later this week when I'm going to be back to regular work with a million things going on at once).
But again, thanks very much for your help.