> ....
> I hope that explains what I wouldn't mind seeing in a Smalltalk text editor.

Yes, I've found myself doing that quite a bit and have not found a
better way with Squeak than C&P.  It's surprisingly cumbersome
relative to seeing just one simple little close-brace in the way.  But
since I'm composing expressions mode, I don't like to fiddle with the
closing brace on its own, so I C&P the expression.  Yes, a hot-key for
that would be nice.